Setup workflows for forgejo

.forgejo/workflows/docker.yml

@@ -0,0 +1,63 @@
+name: Build docker images
+
+on:
+  push:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Node.js
+        uses: actions/setup-node@v2
+        with:
+          node-version: '18'
+
+      - name: Set up QEMU
+        id: qemu
+        uses: docker/setup-qemu-action@v3
+        with:
+          platforms: arm64
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Extract version from Cargo.toml
+        shell: bash
+        run: |
+          echo "EW_VERSION=$(grep "^version" Cargo.toml | sed -E 's/version\s*=\s*["]([^"]*)["]/\1/')" >> $GITHUB_ENV
+
+      - name: Log in to DockerHub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Calculate docker image tag
+        id: set-tag
+        uses: docker/metadata-action@master
+        with:
+          images: |
+            docker.io/ethanaobrien/ew            
+          flavor: |
+            latest=false            
+          tags: |
+            type=raw,value=latest
+
+      - name: Build and push all platforms
+        id: build-and-push
+        uses: docker/build-push-action@v6
+        with:
+          push: true
+          labels: |
+            gitsha1=${{ github.sha }}
+            org.opencontainers.image.version=${{ env.EW_VERSION }}
+          tags: "${{ steps.set-tag.outputs.tags }}"
+          file: "docker/Dockerfile"
+          platforms: linux/amd64,linux/arm64
+
+          # arm64 builds OOM without the git fetch setting. c.f.
+          # https://github.com/rust-lang/cargo/issues/10583
+          build-args: |
+            CARGO_NET_GIT_FETCH_WITH_CLI=true