Attempt to get docker builds going

.github/workflows/docker.yml

@@ -0,0 +1,66 @@
+name: Create and publish a Docker image
+
+on:
+  push:
+    branches: ['main', 'docker-build-test']
+    tags: ['v*']
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    # Sets the permissions granted to the `GITHUB_TOKEN` for the actions in this job.
+    permissions:
+      contents: read
+      packages: write
+      # 
+    steps:
+      - name: Checkout repository
+        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: Cache Docker layers
+        uses: actions/cache@v3
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
+      - name: Log in to the Container registry
+        uses: docker/login-action@v4
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      # This step uses [docker/metadata-action](https://github.com/docker/metadata-action#about) to extract tags and labels that will be applied to the specified image. The `id` "meta" allows the output of this step to be referenced in a subsequent step. The `images` value provides the base name for the tags and labels.
+      - name: Get tags
+        id: tags
+        run: |
+          echo "value<<EOF" >> $GITHUB_OUTPUT
+          ./docker/get-docker-tags.sh "$(date -u +%F)" >> $GITHUB_OUTPUT
+          echo "EOF" >> $GITHUB_OUTPUT
+        shell: bash
+      - name: Build Docker image and publish to Docker Hub
+        uses: docker/build-push-action@v5
+        with:
+          platforms: linux/amd64,linux/arm/v7,linux/arm64/v8
+          context: .
+          push: true
+          file: ./Dockerfile
+          tags: "${{ steps.tags.outputs.value }}"
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache-new
+
+      # https://github.com/docker/build-push-action/issues/252
+      # https://github.com/moby/buildkit/issues/1896
+      - name: Move cache to limit growth
+        run: |
+          rm -rf /tmp/.buildx-cache
+          mv /tmp/.buildx-cache-new /tmp/.buildx-cache

Dockerfile

@@ -1,4 +1,10 @@
 FROM --platform=${BUILDPLATFORM:-linux/amd64} golang:1.20-bullseye AS builder
+
+LABEL org.opencontainers.image.source=https://github.com/ipfs/rainbow
+LABEL org.opencontainers.image.description="A stand-alone IPFS Gateway"
+LABEL org.opencontainers.image.licenses=MIT+APACHE_2.0
+
+
 # This builds rainbow
 
 ARG TARGETPLATFORM TARGETOS TARGETARCH