build: github workflow to build, run tests and publish release draft

- builds the zip and runs the unit tests

.github/workflows/build.yml

@@ -0,0 +1,132 @@
+# GitHub Actions workflow for testing and preparing the plugin release.
+# GitHub Actions reference: https://help.github.com/en/actions
+
+name: Coder Toolbox Plugin Build
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  # Run plugin tests on every supported platform.
+  test:
+    strategy:
+      matrix:
+        platform:
+          - ubuntu-latest
+          - macos-latest
+          - windows-latest
+    runs-on: ${{ matrix.platform }}
+    steps:
+      - uses: actions/checkout@v4.2.2
+
+      - uses: actions/setup-java@v4
+        with:
+          distribution: zulu
+          java-version: 21
+          cache: gradle
+
+      - uses: gradle/wrapper-validation-action@v3.5.0
+
+      # Run tests
+      - run: ./gradlew test --info
+
+      # Collect Tests Result of failed tests
+      - if: ${{ failure() }}
+        uses: actions/upload-artifact@v4
+        with:
+          name: tests-result
+          path: ${{ github.workspace }}/build/reports/tests
+
+  build:
+    name: Build
+    needs: test
+    runs-on: ubuntu-latest
+    outputs:
+      version: ${{ steps.properties.outputs.version }}
+      changelog: ${{ steps.properties.outputs.changelog }}
+    steps:
+      # Check out current repository
+      - name: Fetch Sources
+        uses: actions/checkout@v4.2.2
+
+      # Setup Java 21 environment for the next steps
+      - name: Setup Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: zulu
+          java-version: 21
+          cache: gradle
+
+      # Set environment variables
+      - name: Export Properties
+        id: properties
+        shell: bash
+        run: |
+          PROPERTIES="$(./gradlew properties --console=plain -q)"
+          VERSION="$(echo "$PROPERTIES" | grep "^version:" | cut -f2- -d ' ')"
+          NAME="$(echo "$PROPERTIES" | grep "^group:" | cut -f2- -d ' ')"
+          CHANGELOG="$(./gradlew getChangelog --unreleased --no-header --console=plain -q)"
+          CHANGELOG="${CHANGELOG//'%'/'%25'}"
+          CHANGELOG="${CHANGELOG//$'\n'/'%0A'}"
+          CHANGELOG="${CHANGELOG//$'\r'/'%0D'}"
+          echo "::set-output name=version::$VERSION"
+          echo "::set-output name=name::$NAME"
+          echo "::set-output name=changelog::$CHANGELOG"
+
+      # Run plugin build
+      - name: Run Build
+        run: ./gradlew clean buildZip --info
+
+      # Prepare plugin archive content for creating artifact
+      - name: Prepare Plugin Artifact
+        id: artifact
+        shell: bash
+        run: |
+          cd ${{ github.workspace }}/build/distributions
+          FILENAME=`ls *.zip`
+          unzip "$FILENAME" -d content
+          echo "::set-output name=filename::${FILENAME:0:-4}"
+      # Store already-built plugin as an artifact for downloading
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ steps.artifact.outputs.filename }}
+          path: ./build/distributions/content/*/*
+
+  # Prepare a draft release for GitHub Releases page for the manual verification
+  # If accepted and published, release workflow would be triggered
+  releaseDraft:
+    name: Release Draft
+    if: github.event_name != 'pull_request'
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+
+      # Check out current repository
+      - name: Fetch Sources
+        uses: actions/checkout@v4.2.2
+
+      # Remove old release drafts by using the curl request for the available releases with draft flag
+      - name: Remove Old Release Drafts
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          gh api repos/{owner}/{repo}/releases \
+            --jq '.[] | select(.draft == true) | .id' \
+            | xargs -I '{}' gh api -X DELETE repos/{owner}/{repo}/releases/{}
+      # Create new release draft - which is not publicly visible and requires manual acceptance
+      - name: Create Release Draft
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          gh release create v${{ needs.build.outputs.version }} \
+            --draft \
+            --target ${GITHUB_REF_NAME} \
+            --title "v${{ needs.build.outputs.version }}" \
+            --notes "$(cat << 'EOM'
+          ${{ needs.build.outputs.changelog }}
+          EOM
+          )"