ci: multi-arch image via native runners (amd64 + arm64)

.github/workflows/nomploy.yml

@@ -1,12 +1,14 @@
 name: Docker Publish (GHCR)
 
-# Builds the nomploy app image and pushes it to the GitHub Container Registry.
-# Uses the built-in GITHUB_TOKEN — no external registry secrets required.
+# Builds a multi-arch (amd64 + arm64) app image and pushes it to the GitHub
+# Container Registry using the built-in GITHUB_TOKEN — no external secrets.
 #
-# NOTE: the published package (ghcr.io/<owner>/nomploy) inherits the repo's
-# visibility. For `install.sh` to `docker pull` without auth on a fresh server,
-# set the package to Public in its GitHub package settings (or `docker login
-# ghcr.io` on the server).
+# Each architecture is built on its OWN native runner (fast, no QEMU emulation),
+# pushed by digest, then a merge job assembles one multi-arch manifest. Native
+# arm64 runners (ubuntu-24.04-arm) are free for public repositories.
+#
+# NOTE: for `install.sh` to `docker pull` without auth, the ghcr package must be
+# Public (set it in the package settings once).
 
 on:
   push:
@@ -18,20 +20,27 @@ permissions:
   contents: read
   packages: write
 
+env:
+  IMAGE: ghcr.io/nomploy/nomploy
+
 jobs:
-  build-and-push:
-    runs-on: ubuntu-latest
-    timeout-minutes: 120
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - platform: linux/amd64
+            arch: amd64
+            runner: ubuntu-latest
+          - platform: linux/arm64
+            arch: arm64
+            runner: ubuntu-24.04-arm
+    runs-on: ${{ matrix.runner }}
+    timeout-minutes: 60
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
-      # QEMU lets a single amd64 runner also build the arm64 image (emulated).
-      # Simpler and plan-independent; slower than native arm runners. For faster
-      # builds, split into native amd64 + ubuntu-24.04-arm jobs with a manifest.
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
-
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
@@ -42,34 +51,72 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Compute lowercase image name
-        id: img
+      - name: Prepare env file
+        run: |
+          cp apps/dokploy/.env.production.example .env.production
+          cp apps/dokploy/.env.production.example apps/dokploy/.env.production
+
+      - name: Build and push by digest
+        id: build
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          platforms: ${{ matrix.platform }}
+          outputs: type=image,name=${{ env.IMAGE }},push-by-digest=true,name-canonical=true,push=true
+          cache-from: type=gha,scope=${{ matrix.arch }}
+          cache-to: type=gha,mode=max,scope=${{ matrix.arch }}
+
+      - name: Export digest
         run: |
-          owner=$(echo "${{ github.repository_owner }}" | tr '[:upper:]' '[:lower:]')
-          echo "name=ghcr.io/${owner}/nomploy" >> "$GITHUB_OUTPUT"
+          mkdir -p /tmp/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "/tmp/digests/${digest#sha256:}"
+
+      - name: Upload digest
+        uses: actions/upload-artifact@v4
+        with:
+          name: digests-${{ matrix.arch }}
+          path: /tmp/digests/*
+          if-no-files-found: error
+          retention-days: 1
+
+  merge:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download digests
+        uses: actions/download-artifact@v4
+        with:
+          path: /tmp/digests
+          pattern: digests-*
+          merge-multiple: true
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Docker metadata (tags + labels)
         id: meta
         uses: docker/metadata-action@v5
         with:
-          images: ${{ steps.img.outputs.name }}
+          images: ${{ env.IMAGE }}
           tags: |
             type=raw,value=latest,enable={{is_default_branch}}
             type=ref,event=tag
             type=sha,format=short
 
-      - name: Prepare env file
+      - name: Create and push multi-arch manifest
+        working-directory: /tmp/digests
         run: |
-          cp apps/dokploy/.env.production.example .env.production
-          cp apps/dokploy/.env.production.example apps/dokploy/.env.production
+          docker buildx imagetools create \
+            $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
+            $(printf '${{ env.IMAGE }}@sha256:%s ' *)
 
-      - name: Build and push
-        uses: docker/build-push-action@v6
-        with:
-          context: .
-          platforms: linux/amd64,linux/arm64
-          push: true
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
+      - name: Inspect image
+        run: docker buildx imagetools inspect ${{ env.IMAGE }}:latest