automates runner image build on push

.github/workflows/images.yaml

@@ -0,0 +1,43 @@
+name: images
+
+on:
+  push:
+    branches:
+    - main
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+    steps:
+    -
+      name: Checkout
+      uses: actions/checkout@v4
+    -
+      name: Set up QEMU
+      uses: docker/setup-qemu-action@v3
+    -
+      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.repository_owner }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+    -
+      name: Build and push runner
+      uses: docker/build-push-action@v5
+      env:
+        SOURCE_DATE_EPOCH: 0
+      with:
+        context: .
+        file: runner.Dockerfile
+        tags: |
+          ghcr.io/yolean/ystack-runner:${{ github.sha }}
+        platforms: linux/amd64,linux/arm64/v8
+        push: true
+        cache-from: type=gha
+        cache-to: type=gha,mode=max