Add setup-buildx action (#71)

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

.github/workflows/setup-buildx-ci.yml

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+name: setup-buildx-ci
+
+on:
+  push:
+    paths:
+      - .github/workflows/setup-buildx-ci.yml
+      - setup-buildx/**
+  pull_request:
+    paths:
+      - .github/workflows/setup-buildx-ci.yml
+      - setup-buildx/**
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        buildx-version:
+          - latest
+          - v0.2.2
+    steps:
+      -
+        name: Runner info
+        run: |
+          sudo apt-get install -y hwinfo
+          sudo hwinfo --short
+          sudo mount
+      -
+        name: Checkout
+        uses: actions/checkout@v2.3.1
+      -
+        name: Set up Docker Buildx
+        id: buildx
+        uses: ./setup-buildx/
+        with:
+          buildx-version: ${{ matrix.buildx-version }}
+      -
+        name: Available platforms
+        run: echo ${{ steps.buildx.outputs.platforms }}

.github/workflows/setup-buildx-precheckin.yml

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+name: setup-buildx-precheckin
+
+on:
+  push:
+    paths:
+      - .github/workflows/setup-buildx-precheckin.yml
+      - setup-buildx/**
+  pull_request:
+    paths:
+      - .github/workflows/setup-buildx-precheckin.yml
+      - setup-buildx/**
+
+jobs:
+  pre-checkin:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2.3.1
+      -
+        name: Install
+        run: yarn --cwd ./setup-buildx/ install
+      -
+        name: Pre-checkin
+        run: yarn --cwd ./setup-buildx/ run pre-checkin
+      -
+        name: Check for uncommitted changes
+        run: |
+          if [[ `git status --porcelain` ]]; then
+            git status --porcelain
+            echo "::warning::Found changes. Please run 'yarn --cwd ./setup-buildx/ run pre-checkin' and push"
+          fi

.github/workflows/setup-buildx-test.yml

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+name: setup-buildx-test
+
+on:
+  push:
+    paths:
+      - .github/workflows/setup-buildx-test.yml
+      - setup-buildx/**
+  pull_request:
+    paths:
+      - .github/workflows/setup-buildx-test.yml
+      - setup-buildx/**
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2.3.1
+      -
+        name: Install
+        run: yarn install
+      -
+        name: Test
+        run: yarn run test
+#      -
+#        name: Upload coverage
+#        uses: codecov/codecov-action@v1.0.7
+#        if: success()
+#        with:
+#          token: ${{ secrets.CODECOV_TOKEN }}
+#          file: ./coverage/clover.xml

setup-buildx/.editorconfig

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+# This file is for unifying the coding style for different editors and IDEs.
+# More information at http://editorconfig.org
+
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false

setup-buildx/.gitattributes

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+/dist/** linguist-generated=true
+/lib/** linguist-generated=true

setup-buildx/.gitignore

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+node_modules
+lib
+
+# Jetbrains
+/.idea
+/*.iml
+
+# Rest of the file pulled from https://github.com/github/gitignore/blob/master/Node.gitignore
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+jspm_packages/
+
+# TypeScript v1 declaration files
+typings/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+.env.test
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+
+# next.js build output
+.next
+
+# nuxt.js build output
+.nuxt
+
+# vuepress build output
+.vuepress/dist
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/

setup-buildx/.prettierrc.json

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+{
+  "printWidth": 120,
+  "tabWidth": 2,
+  "useTabs": false,
+  "semi": true,
+  "singleQuote": true,
+  "trailingComma": "none",
+  "bracketSpacing": false,
+  "arrowParens": "avoid",
+  "parser": "typescript"
+}

setup-buildx/README.md

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+## About
+
+GitHub Action to set up Docker [Buildx](https://github.com/docker/buildx).
+
+___
+
+* [Usage](#usage)
+  * [Quick start](#quick-start)
+* [Customizing](#customizing)
+  * [inputs](#inputs)
+  * [outputs](#outputs)
+  * [environment variables](#environment-variables)
+* [Limitation](#limitation)
+
+## Usage
+
+### Quick start
+
+```yaml
+name: ci
+
+on:
+  pull_request:
+    branches: master
+  push:
+    branches: master
+    tags:
+
+jobs:
+  buildx:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+      -
+        name: Set up Docker Buildx
+        id: buildx
+        uses: docker/action/setup-buildx@v2
+        with:
+          buildx-version: latest
+      -
+        name: Available platforms
+        run: echo ${{ steps.buildx.outputs.platforms }}
+```
+
+## Customizing
+
+### inputs
+
+Following inputs can be used as `step.with` keys
+
+| Name             | Type    | Default   | Description                        |
+|------------------|---------|-----------|------------------------------------|
+| `buildx-version` | String  | `latest`  | [Buildx](https://github.com/docker/buildx) version. Example: `v0.3.0` |
+
+### outputs
+
+Following outputs are available
+
+| Name          | Type    | Description                           |
+|---------------|---------|---------------------------------------|
+| `platforms`   | String  | Available platforms (comma separated) |
+
+### environment variables
+
+The following [official docker environment variables](https://docs.docker.com/engine/reference/commandline/cli/#environment-variables) are supported:
+
+| Name            | Type    | Default      | Description                                    |
+|-----------------|---------|-------------|-------------------------------------------------|
+| `DOCKER_CONFIG` | String  | `~/.docker` | The location of your client configuration files |
+
+## Limitation
+
+This action is only available for Linux [virtual environments](https://help.github.com/en/articles/virtual-environments-for-github-actions#supported-virtual-environments-and-hardware-resources).

setup-buildx/__tests__/github.test.ts

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+import * as github from '../src/github';
+
+describe('github', () => {
+  it('returns latest buildx GitHub release', async () => {
+    const release = await github.getRelease('latest');
+    console.log(release);
+    expect(release).not.toBeNull();
+    expect(release?.tag_name).not.toEqual('');
+  });
+
+  it('returns v0.2.2 buildx GitHub release', async () => {
+    const release = await github.getRelease('v0.2.2');
+    console.log(release);
+    expect(release).not.toBeNull();
+    expect(release?.tag_name).toEqual('v0.2.2');
+  });
+});

setup-buildx/__tests__/installer.test.ts

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+import fs = require('fs');
+import * as installer from '../src/installer';
+import * as path from 'path';
+import * as os from 'os';
+
+const tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'ghaction-docker-buildx-'));
+
+describe('installer', () => {
+  it('acquires v0.2.2 version of buildx', async () => {
+    const buildx = await installer.buildx('v0.2.2', tmpDir);
+    console.log(buildx);
+    expect(fs.existsSync(buildx)).toBe(true);
+  }, 100000);
+
+  it('acquires latest version of buildx', async () => {
+    const buildx = await installer.buildx('latest', tmpDir);
+    console.log(buildx);
+    expect(fs.existsSync(buildx)).toBe(true);
+  }, 100000);
+});

setup-buildx/action.yml

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+# https://help.github.com/en/articles/metadata-syntax-for-github-actions
+name: 'Docker - Setup Buildx'
+description: 'GitHub Action to set up Docker Buildx'
+author: 'crazy-max'
+branding:
+  color: 'blue'
+  icon: 'truck'
+
+inputs:
+  buildx-version:
+    description: 'Buildx version. Example: v0.3.0'
+    default: 'latest'
+    required: false
+
+outputs:
+  platforms:
+    description: 'Available platforms (comma separated)'
+
+runs:
+  using: 'node12'
+  main: 'dist/index.js'
+  post: 'dist/index.js'