Speedup docker build in CI (#723)

* Speedup docker build in CI

* Set github token readonly permissions

* Del trivy-setup

* Revert permissions block

Author: evgeny-stakewise

.github/workflows/docker.yaml

@@ -4,8 +4,16 @@ on: [push]
 
 jobs:
   docker:
-    name: Build Docker Image
-    runs-on: ubuntu-latest
+    name: Build Docker Image (${{ matrix.platform }})
+    runs-on: ${{ matrix.runner }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - platform: linux/amd64
+            runner: ubuntu-latest
+          - platform: linux/arm64
+            runner: ubuntu-24.04-arm
     steps:
       - name: Checkout code
         uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
@@ -35,20 +43,87 @@ jobs:
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
-      - name: Build and push
+      - name: Build and push by digest
+        id: build
         uses: docker/build-push-action@ca052bb54ab0790a636c9b5f226502c73d547a25 # v5
         with:
           context: .
-          push: ${{ github.event_name != 'pull_request' }}
-          tags: ${{ steps.meta.outputs.tags }}
+          platforms: ${{ matrix.platform }}
           labels: ${{ steps.meta.outputs.labels }}
-          platforms: linux/amd64,linux/arm64
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
+          outputs: type=image,"name=europe-west4-docker.pkg.dev/stakewiselabs/public/v3-operator,stakewiselabs/v3-operator",push-by-digest=true,name-canonical=true,push=true
+          cache-from: type=gha,scope=${{ matrix.platform }}
+          cache-to: type=gha,mode=max,scope=${{ matrix.platform }}
+      - name: Export digest
+        run: |
+          mkdir -p /tmp/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "/tmp/digests/${digest#sha256:}"
+      - name: Upload digest
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
+        with:
+          name: digests-${{ matrix.platform == 'linux/amd64' && 'amd64' || 'arm64' }}
+          path: /tmp/digests/*
+          if-no-files-found: error
+          retention-days: 1
+
+  docker-merge:
+    name: Merge Docker Manifests
+    needs: docker
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download digests
+        uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4
+        with:
+          path: /tmp/digests
+          pattern: digests-*
+          merge-multiple: true
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@b2391d37b4157fa4aa2e118d643f417910ff3242 # v3
+        with:
+          images: |
+            europe-west4-docker.pkg.dev/stakewiselabs/public/v3-operator
+            stakewiselabs/v3-operator
+          flavor: |
+            latest=auto
+          tags: |
+            type=ref,event=branch
+            type=ref,event=tag
+            type=sha
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f # v3
+      - name: Login to GAR
+        uses: docker/login-action@c94ce9fb468520275223c153574b00df6fe4bcc9 # v3
+        with:
+          registry: europe-west4-docker.pkg.dev
+          username: _json_key
+          password: ${{ secrets.GAR_JSON_KEY }}
+      - name: Login to Docker Hub
+        uses: docker/login-action@c94ce9fb468520275223c153574b00df6fe4bcc9 # v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Create and push manifest (GAR)
+        working-directory: /tmp/digests
+        env:
+          DOCKER_METADATA_OUTPUT_JSON: ${{ steps.meta.outputs.json }}
+        run: |
+          docker buildx imagetools create \
+            $(jq -cr '.tags | map(select(startswith("europe-west4-docker.pkg.dev/"))) | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
+            $(printf 'europe-west4-docker.pkg.dev/stakewiselabs/public/v3-operator@sha256:%s ' *)
+      - name: Create and push manifest (Docker Hub)
+        working-directory: /tmp/digests
+        env:
+          DOCKER_METADATA_OUTPUT_JSON: ${{ steps.meta.outputs.json }}
+        run: |
+          docker buildx imagetools create \
+            $(jq -cr '.tags | map(select(startswith("stakewiselabs/"))) | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
+            $(printf 'stakewiselabs/v3-operator@sha256:%s ' *)
+
   scanner:
     name: Trivy scanner
     runs-on: ubuntu-latest
-    needs: docker
+    needs: docker-merge
     steps:
       - id: commit-hash
         uses: prompt/actions-commit-hash@01d19a83c242e1851c9aa6cf9625092ecd095d09 # v2