Add Woodpecker CI plugin workflow

Author: head1328

.github/workflows/woodpecker-plugin.yml

@@ -0,0 +1,84 @@
+---
+name: Woodpecker Plugin - Build and Publish
+
+on:
+  push:
+    branches: [main, feat/woodpecker-ci-plugin]
+    paths:
+      - 'woodpecker-plugin/**'
+      - 'common/**'
+      - '.github/workflows/woodpecker-plugin.yml'
+  pull_request:
+    paths:
+      - 'woodpecker-plugin/**'
+      - 'common/**'
+      - '.github/workflows/woodpecker-plugin.yml'
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  build-and-push:
+    name: Build and push Woodpecker plugin image
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels)
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository_owner }}/devcontainer-build-run-woodpecker
+          tags: |
+            # Tag as 'latest' for pushes to main
+            type=raw,value=latest,enable={{is_default_branch}}
+            # Tag as 'pr-NUMBER' for pull requests
+            type=ref,event=pr,prefix=pr-
+            # Tag as branch name for other branches
+            type=ref,event=branch
+            # Tag as sha for commits
+            type=sha,prefix={{branch}}-
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./woodpecker-plugin/Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Show image details
+        run: |
+          echo "## Woodpecker Plugin Image Published! 🎉" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "**Image Tags:**" >> $GITHUB_STEP_SUMMARY
+          echo '```' >> $GITHUB_STEP_SUMMARY
+          echo "${{ steps.meta.outputs.tags }}" >> $GITHUB_STEP_SUMMARY
+          echo '```' >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "**Usage in Woodpecker CI:**" >> $GITHUB_STEP_SUMMARY
+          echo '```yaml' >> $GITHUB_STEP_SUMMARY
+          echo "steps:" >> $GITHUB_STEP_SUMMARY
+          echo "  - name: build-devcontainer" >> $GITHUB_STEP_SUMMARY
+          echo "    image: ghcr.io/${{ github.repository_owner }}/devcontainer-build-run-woodpecker:latest" >> $GITHUB_STEP_SUMMARY
+          echo "    settings:" >> $GITHUB_STEP_SUMMARY
+          echo "      sub_folder: .devcontainer" >> $GITHUB_STEP_SUMMARY
+          echo "      image_name: my-devcontainer" >> $GITHUB_STEP_SUMMARY
+          echo "      image_tag: latest" >> $GITHUB_STEP_SUMMARY
+          echo '```' >> $GITHUB_STEP_SUMMARY