chore: enable Docker CI

Signed-off-by: Chris Gianelloni <[email protected]>

Author: wolf31o2

.github/workflows/ci-docker.yml

@@ -0,0 +1,34 @@
+name: Docker CI
+
+on:
+  pull_request:
+    branches: ['main']
+    paths: ['Dockerfile','bin','config','.github/workflows/ci-docker.yml']
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: cloudstruct/cardano-node
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: qemu
+        uses: docker/setup-qemu-action@v1
+      - uses: docker/setup-buildx-action@v1
+      - id: meta
+        uses: docker/metadata-action@v3
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+      - name: build
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          push: false
+          ### TODO: test multiple platforms
+          # platforms: linux/amd64,linux/arm64
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          ### TODO: cache artifacts
+          #cache-to: type=gha,mode=max