build: provide Docker images from GitHub releases (#6) (#13)

.cargo/config

@@ -0,0 +1,3 @@
+[target.thumbv7em-none-eabi]
+linker = "utils/alpine-linker-script.sh"
+#ar = "arm-none-eabi-ar"

.github/workflows/docker-build.yml

@@ -0,0 +1,52 @@
+on:
+  push:
+    tags:
+      - 'v**'
+    branches:
+      - main
+
+name: Docker Build
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Extract branch name
+        shell: bash
+        run: echo "branch=$(echo ${GITHUB_REF#refs/heads/})" >>$GITHUB_OUTPUT
+        id: extract_branch
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          file: utils/docker/Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          build-args: |
+            git_treeish=${{ steps.extract_branch.outputs.branch }}

.gitignore

@@ -1,5 +1,4 @@
 /target
-/Cargo.lock
 
 *~
 .*.sw?