feat: pre-build dev container workflow (#1)

Configures a GitHub Actions workflow which will pre-build a dev container for this project

.github/.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+{
+  "name": "Dev Container",
+  "image": "mcr.microsoft.com/devcontainers/base:jammy",
+
+  "features": {
+    "ghcr.io/devcontainers-contrib/features/copier": {
+      "version": "9.1.1",
+    },
+    "ghcr.io/devcontainers-contrib/features/go-task": {
+      "version": "3.33.1",
+    },
+    "ghcr.io/devcontainers-contrib/features/mkdocs": {
+      "version": "1.5.3",
+    },
+    "ghcr.io/devcontainers/features/node": {
+      "version": "20.11.0",
+    },
+    "ghcr.io/devcontainers-contrib/features/pre-commit": {
+      "version": "3.6.0",
+    },
+    "ghcr.io/devcontainers/features/python": {
+      "version": "3.12.1",
+    },
+  },
+
+  "customizations": {
+    "vscode": {
+      "extensions": ["EditorConfig.EditorConfig", "redhat.vscode-yaml"],
+    },
+  },
+}

.github/.devcontainer/workflows/devcontainer-build-and-push.yaml

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+name: Dev Container Build and Push Image
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - "main"
+    tags:
+      - "v*.*.*"
+    pull_requests:
+      branches:
+        - "main"
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        id: checkout
+        uses: actions/checkout@v1
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Pre-build dev container image
+        uses: devcontainers/ci@v0.2
+        with:
+          subFolder: .github
+          imageName: ghcr.io/${{ github.repository }}
+          cacheFrom: ghcr.io/${{ github.repository }}
+          push: always