Push private images to GHCR (#3859)

.github/workflows/build-private-images-ghcr.yml

@@ -0,0 +1,67 @@
+name: Build Private Images GHCR
+
+on:
+  push:
+    branches: [master, stable]
+    tags: ['r*']
+  pull_request:
+    types: [synchronize, labeled]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    if: ${{ github.event_name == 'push' || contains(github.event.pull_request.labels.*.name, 'deploy-to-staging') }}
+    runs-on: buildjet-16vcpu-ubuntu-2204
+
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5.0.0
+        with:
+          images: ghcr.io/plausible/analytics/ee
+          tags: |
+            type=ref,event=pr
+            type=ref,event=branch
+            type=ref,event=tag
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        id: docker_build
+        uses: docker/build-push-action@v5
+        with:
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          build-args: |
+            MIX_ENV=prod
+            BUILD_METADATA=${{ steps.meta.outputs.json }}
+
+      - name: Image digest
+        run: echo ${{ steps.docker_build.outputs.digest }}
+
+      - name: Notify team on failure
+        if: ${{ failure() }}
+        uses: fjogeleit/http-request-action@v1
+        with:
+          url: ${{ secrets.BUILD_NOTIFICATION_URL }}
+          method: 'POST'
+          customHeaders: '{"Content-Type": "application/json"}'
+          data: '{"content": "<a href=\"https://github.com/plausible/analytics/actions/workflows/build-private-images.yml\">Build failed</a>"}'