ci: speed up multi-arch publish and trigger Coolify deploy

Build amd64/arm64 on native runners, cache Docker layers per platform, and redeploy via WEBHOOK_URL after pushing to GHCR.

Author: bgwastu

.github/workflows/publish.yml

@@ -5,21 +5,86 @@ on:
     branches: [main]
     tags: ["v*"]
 
+concurrency:
+  group: publish-${{ github.ref }}
+  cancel-in-progress: true
+
 env:
   REGISTRY: ghcr.io
   IMAGE_NAME: ${{ github.repository }}
 
 jobs:
-  build-and-push:
-    runs-on: ubuntu-latest
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - platform: linux/amd64
+            runner: ubuntu-latest
+          - platform: linux/arm64
+            runner: ubuntu-24.04-arm
+    runs-on: ${{ matrix.runner }}
     permissions:
       contents: read
       packages: write
 
     steps:
+      - name: Prepare
+        run: |
+          platform=${{ matrix.platform }}
+          echo "PLATFORM_PAIR=${platform//\//-}" >> "$GITHUB_ENV"
+
       - uses: actions/checkout@v4
 
-      - uses: docker/setup-qemu-action@v3
+      - uses: docker/setup-buildx-action@v3
+
+      - uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - uses: docker/metadata-action@v5
+        id: meta
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - uses: docker/build-push-action@v6
+        id: build
+        with:
+          context: .
+          platforms: ${{ matrix.platform }}
+          labels: ${{ steps.meta.outputs.labels }}
+          outputs: type=image,name=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }},push-by-digest=true,name-canonical=true,push=true
+          cache-from: type=gha,scope=build-${{ env.PLATFORM_PAIR }}
+          cache-to: type=gha,scope=build-${{ env.PLATFORM_PAIR }},mode=max
+
+      - name: Export digest
+        run: |
+          mkdir -p "${{ runner.temp }}/digests"
+          digest="${{ steps.build.outputs.digest }}"
+          touch "${{ runner.temp }}/digests/${digest#sha256:}"
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: digests-${{ env.PLATFORM_PAIR }}
+          path: ${{ runner.temp }}/digests/*
+          if-no-files-found: error
+          retention-days: 1
+
+  merge:
+    needs: build
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          path: ${{ runner.temp }}/digests
+          pattern: digests-*
+          merge-multiple: true
 
       - uses: docker/setup-buildx-action@v3
 
@@ -39,12 +104,32 @@ jobs:
             type=semver,pattern={{version}}
             type=sha
 
-      - 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: Create manifest list and push
+        working-directory: ${{ runner.temp }}/digests
+        run: |
+          docker buildx imagetools create \
+            $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
+            $(printf '${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}@sha256:%s ' *)
+
+      - name: Inspect image
+        run: |
+          docker buildx imagetools inspect \
+            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.meta.outputs.version }}
+
+  deploy:
+    needs: merge
+    if: github.ref == 'refs/heads/main'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Trigger deployment
+        env:
+          WEBHOOK_URL: ${{ secrets.WEBHOOK_URL }}
+          WEBHOOK_TOKEN: ${{ secrets.WEBHOOK_TOKEN }}
+        run: |
+          if [ -z "$WEBHOOK_URL" ] || [ -z "$WEBHOOK_TOKEN" ]; then
+            echo "WEBHOOK_URL / WEBHOOK_TOKEN secrets are not set; skipping deploy."
+            exit 0
+          fi
+          curl --fail --show-error --silent \
+            --request GET "$WEBHOOK_URL" \
+            --header "Authorization: Bearer $WEBHOOK_TOKEN"

Dockerfile

@@ -1,3 +1,5 @@
+# syntax=docker/dockerfile:1
+
 # Node 24 LTS (Alpine) — Next.js 16
 FROM node:24-alpine AS base
 
@@ -7,7 +9,8 @@ RUN apk add --no-cache libc6-compat
 WORKDIR /app
 
 COPY package.json package-lock.json ./
-RUN npm ci
+RUN --mount=type=cache,target=/root/.npm \
+    npm ci
 
 # Rebuild the source code only when needed
 FROM base AS builder
@@ -18,7 +21,8 @@ COPY . .
 # Next.js expects ./public to exist; empty dirs often aren't in the image/context.
 RUN mkdir -p public
 
-RUN npx next build --webpack
+RUN --mount=type=cache,target=/app/.next/cache \
+    npx next build --webpack
 
 # Production image
 FROM base AS runner