ci: build all targets

.github/workflows/ci.yml

@@ -0,0 +1,52 @@
+name: Continuous Integration
+
+on:
+  pull_request: null
+  push:
+    branches:
+      - main
+  workflow_dispatch: null
+
+env:
+  DOCKER_REGISTRY: ghcr.io
+  DOCKER_IMAGE_BASE: jstz-dev
+
+jobs:
+  build-docker:
+    name: Build and push Docker images
+    strategy:
+      matrix:
+        include:
+          - image: x86_64
+          - image: riscv64
+          - image: aarch64
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: 'true'
+      - uses: docker/setup-buildx-action@v3
+      - uses: docker/login-action@v3
+        with:
+          registry: '${{ env.DOCKER_REGISTRY }}'
+          username: '${{ github.actor }}'
+          password: '${{ secrets.GITHUB_TOKEN }}'
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v3
+        with:
+          images: >-
+            ${{ env.DOCKER_REGISTRY }}/${{ env.DOCKER_IMAGE_BASE }}/hermit-toolchain-${{ matrix.image }}
+          tags: |
+            type=ref,event=tag
+            {{date 'YYYYMMDD'}}
+      - uses: docker/[email protected]
+        with:
+          context: .
+          push: true
+          build-args: |
+            TARGET=${{ matrix.image }}-hermit
+          cache-from: type=gha
+          cache-to: 'type=gha,mode=max'
+          tags: '${{ steps.meta.outputs.tags }}'
+          labels: '${{ steps.meta.outputs.labels }}'