[CI/CD] Introduce workflows to test dbt installations (#64)

* Add workflows to test different dbt installations methods;
* Add `main` and `homebrew` workflows implementation and dummy implementation for other workflows;

.github/workflows/test-dbt-installation-docker.yml

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+# **what?**
+
+# **why?**
+
+# **when?**
+# This reusable workflow can be called or started manually
+# by specifying the package name
+
+name: dbt Installation - Docker Integration Tests
+
+on:
+  workflow_dispatch:
+    inputs:
+      package_name:
+        description: "Package name to test (i.e. dbt-postgres)"
+        required: true
+        type: string
+  workflow_call:
+    inputs:
+      package_name:
+        required: true
+        type: string
+    secrets:
+      SLACK_WEBHOOK_URL:
+        description: Slack app webhook url
+        required: true
+
+# no permissions are needed for this workflow
+permissions: {}
+
+jobs:
+  docker-integration-test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: "Output Package Name - ${{ inputs.package_name }}"
+        run: |
+          echo ${{ inputs.package_name }}
+
+  slack-notification:
+    name: "Post Scheduled Run Failures"
+    needs: docker-integration-test
+    if: ${{ failure() && github.event_name == 'schedule' }}
+
+    uses: dbt-labs/dbt-release/.github/workflows/slack-post-notification.yml@main
+    with:
+      status: "failure"
+      notification_title: "Docker nightly integration test failed for - ${{ inputs.package_name }}"
+
+    secrets:
+      SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}

.github/workflows/test-dbt-installation-homebrew.yml

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+# **what?**
+# This workflow installs the latest version of dbt adapter from homebrew.
+# It then runs 'dbt --version' to verify the installation was successful.
+# If it fails for the scheduled runs, it will post to our team alerts channel.
+
+# **why?**
+# This is a simple way to test all adapter installations at a single
+# time. It allows us to test them on a schedule as well to check for
+# any breaking dependency changes that might happen and alert us on it.
+
+# **when?**
+# This reusable workflow can be called or started manually
+# by specifying the package name
+
+name: dbt Installation - Homebrew Integration Tests
+
+on:
+  workflow_dispatch:
+    inputs:
+      package_name:
+        description: "Package name to test (i.e. dbt-postgres)"
+        required: true
+        type: string
+  workflow_call:
+    inputs:
+      package_name:
+        required: true
+        type: string
+    secrets:
+      SLACK_WEBHOOK_URL:
+        description: Slack app webhook url
+        required: true
+
+# no permissions are needed for this workflow
+permissions: {}
+
+jobs:
+  homebrew-integration-test:
+    runs-on: macos-11
+
+    steps:
+      - name: "Prepare Brew"
+        # brew upgrade generates some symlink update warnings that cause failures without the || true.
+        # They're just that the symlink wasn't updated which is okay to ignore.
+        # This does cause other errors to be ignored but for this case that's safe since the brew install
+        # step would likely fail at that point.
+        run: |
+          brew update
+          brew upgrade || true
+
+      - name: "[DEBUG] Show List Of Installed Homebrew Packages"
+        run: |
+          brew list
+
+      - name: "Tap dbt-labs/dbt Repository To Homebrew Formulae"
+        run: |
+          brew tap dbt-labs/dbt
+
+      - name: "[DEBUG] Show List Of All Currently Tapped Repositories"
+        run: |
+          brew tap
+
+      - name: "Brew Install ${{ inputs.package_name }}"
+        run: |
+          brew install --verbose ${{ inputs.package_name }}
+
+      - name: "Verify ${{ inputs.package_name }} Version"
+        run: |
+          dbt --version
+
+  slack-notification:
+    name: "Post Scheduled Run Failures"
+    needs: homebrew-integration-test
+    if: ${{ failure() && github.event_name == 'schedule' }}
+
+    uses: dbt-labs/dbt-release/.github/workflows/slack-post-notification.yml@main
+    with:
+      status: "failure"
+      notification_title: "Homebrew nightly integration test failed for - ${{ inputs.package_name }}"
+
+    secrets:
+      SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}

.github/workflows/test-dbt-installation-main.yml

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+# **what?**
+
+# **why?**
+
+# **when?**
+# This workflow will run on a schedule every night and also can be
+# manually invoked.
+
+name: dbt Installation Tests
+
+on:
+  workflow_dispatch:
+
+  # run this once per night to ensure no regressions
+  # schedule:
+  #   - cron: "0 9,13,18 * * *" # 9:00, 13:00, 18:00 UTC
+
+jobs:
+  dbt-installation-homebrew:
+    if: ${{ always() }}
+    strategy:
+      fail-fast: false
+      matrix:
+        package:
+          ["dbt-postgres", "dbt-redshift", "dbt-snowflake", "dbt-bigquery"]
+
+    uses: .github/workflows/test-dbt-installation-homebrew.yml
+    with:
+      package_name: ${{ matrix.package }}
+    secrets:
+      SLACK_WEBHOOK_URL: ${{ secrets.SLACK_TEST_CHANNEL }}
+
+  dbt-installation-pip:
+    if: ${{ always() }}
+    strategy:
+      fail-fast: false
+      matrix:
+        package:
+          [
+            "dbt-postgres",
+            "dbt-redshift",
+            "dbt-snowflake",
+            "dbt-bigquery",
+            "dbt-spark",
+          ]
+
+    uses: .github/workflows/test-dbt-installation-pip.yml
+    with:
+      package_name: ${{ matrix.package }}
+    secrets:
+      SLACK_WEBHOOK_URL: ${{ secrets.SLACK_TEST_CHANNEL }}
+
+  dbt-installation-docker:
+    if: ${{ always() }}
+    strategy:
+      fail-fast: false
+      matrix:
+        package:
+          [
+            "dbt-postgres",
+            "dbt-redshift",
+            "dbt-snowflake",
+            "dbt-bigquery",
+            "dbt-spark",
+          ]
+
+    uses: .github/workflows/test-dbt-installation-docker.yml
+    with:
+      package_name: ${{ matrix.package }}
+    secrets:
+      SLACK_WEBHOOK_URL: ${{ secrets.SLACK_TEST_CHANNEL }}
+
+  dbt-installation-source:
+    if: ${{ always() }}
+    strategy:
+      fail-fast: false
+      matrix:
+        package:
+          [
+            "dbt-postgres",
+            "dbt-redshift",
+            "dbt-snowflake",
+            "dbt-bigquery",
+            "dbt-spark",
+          ]
+
+    uses: .github/workflows/test-dbt-installation-source.yml
+    with:
+      package_name: ${{ matrix.package }}
+    secrets:
+      SLACK_WEBHOOK_URL: ${{ secrets.SLACK_TEST_CHANNEL }}

.github/workflows/test-dbt-installation-pip.yml

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+# **what?**
+
+# **why?**
+
+# **when?**
+# This reusable workflow can be called or started manually
+# by specifying the package name
+
+name: dbt Installation - pip Integration Tests
+
+on:
+  workflow_dispatch:
+    inputs:
+      package_name:
+        description: "Package name to test (i.e. dbt-postgres)"
+        required: true
+        type: string
+  workflow_call:
+    inputs:
+      package_name:
+        required: true
+        type: string
+    secrets:
+      SLACK_WEBHOOK_URL:
+        description: Slack app webhook url
+        required: true
+
+# no permissions are needed for this workflow
+permissions: {}
+
+jobs:
+  pip-integration-test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: "Output Package Name - ${{ inputs.package_name }}"
+        run: |
+          echo ${{ inputs.package_name }}
+
+  slack-notification:
+    name: "Post Scheduled Run Failures"
+    needs: pip-integration-test
+    if: ${{ failure() && github.event_name == 'schedule' }}
+
+    uses: dbt-labs/dbt-release/.github/workflows/slack-post-notification.yml@main
+    with:
+      status: "failure"
+      notification_title: "pip nightly integration test failed for - ${{ inputs.package_name }}"
+
+    secrets:
+      SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}

.github/workflows/test-dbt-installation-source.yml

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+# **what?**
+
+# **why?**
+
+# **when?**
+# This reusable workflow can be called or started manually 
+# by specifying the package name
+
+name: dbt Installation - Source Integration Tests
+
+on:
+  workflow_dispatch:
+    inputs:
+      package_name:
+        description: "Package name to test (i.e. dbt-postgres)"
+        required: true
+        type: string
+  workflow_call:
+    inputs:
+      package_name:
+        required: true
+        type: string
+    secrets:
+      SLACK_WEBHOOK_URL:
+        description: Slack app webhook url
+        required: true
+
+# no permissions are needed for this workflow
+permissions: {}
+
+jobs:
+  source-integration-test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: "Output Package Name - ${{ inputs.package_name }}"
+        run: |
+          echo ${{ inputs.package_name }}
+
+  slack-notification:
+    name: "Post Scheduled Run Failures"
+    needs: source-integration-test
+    if: ${{ failure() && github.event_name == 'schedule' }}
+
+    uses: dbt-labs/dbt-release/.github/workflows/slack-post-notification.yml@main
+    with:
+      status: "failure"
+      notification_title: "Source nightly integration test failed for - ${{ inputs.package_name }}"
+
+    secrets:
+      SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}