feat(actions): introduce shared workflow for building and pushing docker images

.github/workflows/shared-docker-build.yaml

@@ -0,0 +1,147 @@
+name: Shared Docker Build and Push
+
+on:
+  workflow_call:
+    inputs:
+      image_name:
+        description: 'The name of the Docker image (without registry and owner)'
+        required: true
+        type: string
+      dockerfile:
+        description: 'Path to the Dockerfile'
+        required: false
+        type: string
+        default: './Dockerfile'
+      context:
+        description: 'Build context path'
+        required: false
+        type: string
+        default: '.'
+      trivy_severity:
+        description: 'Trivy severity levels to scan for'
+        required: false
+        type: string
+        default: 'CRITICAL,HIGH,MEDIUM'
+
+env:
+  REGISTRY: ghcr.io
+
+jobs:
+  build:
+    name: Build
+    runs-on: [ default ]
+    permissions:
+      contents: read
+      packages: write
+      # This is used to complete the identity challenge
+      # with sigstore/fulcio when running outside of PRs.
+      id-token: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
+
+      # Install the cosign tool except on PR
+      # https://github.com/sigstore/cosign-installer
+      - name: Install cosign
+        if: github.event_name != 'pull_request'
+        uses: sigstore/cosign-installer@d7543c93d881b35a8faa02e8e3605f69b7a1ce62 # v3.10.0
+
+      # Set up QEMU for cross-platform builds
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@29109295f81e9208d7d86ff1c6c12d2833863392 # v3
+
+      # Set up BuildKit Docker container builder to be able to build
+      # multi-platform images and export cache
+      # https://github.com/docker/setup-buildx-action
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 # v3
+        with:
+          driver-opts: |
+            image=moby/buildkit:latest
+
+      # Login against a Docker registry except on PR
+      # https://github.com/docker/login-action
+      - name: Log into registry ${{ env.REGISTRY }}
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@184bdaa0721073962dff0199f1fb9940f07167d1 # v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      # Extract metadata (tags, labels) for Docker
+      # https://github.com/docker/metadata-action
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@c1e51972afc2121e065aed6d45c65596fe445f3f # v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ github.repository_owner }}/${{ inputs.image_name }}
+          tags: |
+            type=semver,pattern={{version}},prefix=v
+            type=semver,pattern={{major}}.{{minor}},prefix=v
+            type=semver,pattern={{major}},enable=${{ !startsWith(github.ref, 'refs/tags/v0.') }},prefix=v
+            type=ref,event=branch
+            type=ref,event=tag
+            type=ref,event=pr
+            type=schedule
+            type=raw,value=${{ github.sha }}
+            type=sha,enable=true,format=short,prefix=
+            type=edge,branch=master
+
+      # Build and push Docker image with Buildx (don't push on PR)
+      # https://github.com/docker/build-push-action
+      - name: Build and push Docker image
+        id: build-and-push
+        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6
+        with:
+          context: ${{ inputs.context }}
+          file: ${{ inputs.dockerfile }}
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          # remove untagged images produced for multi platform builds
+          provenance: false
+          platforms: |
+            linux/amd64
+            linux/arm64
+
+      # Sign the resulting Docker image digest except on PRs.
+      # This will only write to the public Rekor transparency log when the Docker
+      # repository is public to avoid leaking data.  If you would like to publish
+      # transparency data even for private images, pass --force to cosign below.
+      # https://github.com/sigstore/cosign
+      - name: Sign the published Docker image
+        if: ${{ github.event_name != 'pull_request' }}
+        env:
+          # https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-an-intermediate-environment-variable
+          TAGS: ${{ steps.meta.outputs.tags }}
+          DIGEST: ${{ steps.build-and-push.outputs.digest }}
+        # This step uses the identity token to provision an ephemeral certificate
+        # against the sigstore community Fulcio instance.
+        run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}
+
+  vulnerability-scan:
+    permissions:
+      contents: read
+      packages: read
+      security-events: write
+      actions: read
+    name: Vulnerability Scan
+    needs: build
+    runs-on: [ default ]
+    steps:
+      - name: Run Trivy vulnerability scanner
+        uses: aquasecurity/trivy-action@b6643a29fecd7f34b3597bc6acb0a98b03d33ff8 # 0.33.1
+        if: success()
+        with:
+          image-ref: ${{ env.REGISTRY }}/${{ github.repository_owner }}/${{ inputs.image_name }}:${{ github.sha }}
+          ignore-unfixed: true
+          format: 'sarif'
+          output: 'trivy-results.sarif'
+          severity: ${{ inputs.trivy_severity }}
+
+      - name: Upload Trivy scan results to GitHub Security tab
+        uses: github/codeql-action/upload-sarif@755f44910c12a3d7ca0d8c6e42c048b3362f7cec # v3
+        if: always()
+        with:
+          sarif_file: trivy-results.sarif