Automate building Docker images

.github/workflows/assets.yaml

@@ -1,47 +0,0 @@
-name: Assets build
-on:
-  push:
-    branches:
-      - main
-jobs:
-  main:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - name: Install Erlang & Elixir
-        uses: erlef/setup-beam@v1
-        with:
-          otp-version: '24.0'
-          elixir-version: '1.12.0'
-      - name: Cache Mix
-        uses: actions/cache@v2
-        with:
-          path: |
-            deps
-            _build
-          key: ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-mix-
-      # Note: we need to get Phoenix and LV because package.json points to them directly
-      - name: Install mix dependencies
-        run: mix deps.get
-      - name: Install Node
-        uses: actions/setup-node@v2
-        with:
-          node-version: '14.x'
-      - name: Cache npm dependencies
-        uses: actions/cache@v2
-        with:
-          path: ~/.npm
-          key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
-          restore-keys: |
-            ${{ runner.os }}-node-
-      - name: Install npm dependencies
-        run: npm ci --prefix assets
-      - name: Build assets
-        run: npm run deploy --prefix assets
-      - name: Update assets
-        uses: stefanzweifel/git-auto-commit-action@v4
-        with:
-          commit_message: Update assets
-          file_pattern: priv/static

.github/workflows/deploy.yaml

@@ -0,0 +1,95 @@
+name: Deploy
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - 'v*.*.*'
+jobs:
+  assets:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install Erlang & Elixir
+        uses: erlef/setup-beam@v1
+        with:
+          otp-version: '24.0'
+          elixir-version: '1.12.0'
+      - name: Cache Mix
+        uses: actions/cache@v2
+        with:
+          path: |
+            deps
+            _build
+          key: ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-mix-
+      # Note: we need to get Phoenix and LV because package.json points to them directly
+      - name: Install mix dependencies
+        run: mix deps.get
+      - name: Install Node
+        uses: actions/setup-node@v2
+        with:
+          node-version: '14.x'
+      - name: Cache npm dependencies
+        uses: actions/cache@v2
+        with:
+          path: ~/.npm
+          key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-node-
+      - name: Install npm dependencies
+        run: npm ci --prefix assets
+      - name: Build assets
+        run: npm run deploy --prefix assets
+      - name: Update assets
+        uses: stefanzweifel/git-auto-commit-action@v4
+        with:
+          commit_message: Update assets
+          file_pattern: priv/static
+  docker:
+    # The assets job may push new commit, so we wait for it
+    needs: assets
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v3
+        with:
+          images: livebook/livebook
+          tags: |
+            type=semver,pattern={{version}}
+            type=edge,branch=main
+      - name: Cache Docker layers
+        uses: actions/cache@v2
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          # TODO: switch to type=gha once available:
+          # * pending PR: https://github.com/moby/buildkit/pull/1974
+          # * context: https://github.com/docker/build-push-action/blob/master/docs/advanced/cache.md#github-cache
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache-new
+      - name: Move cache
+        run: |
+          rm -rf /tmp/.buildx-cache
+          mv /tmp/.buildx-cache-new /tmp/.buildx-cache