ci/cache docker layers (#543)

* chore: use the same COPY for go.mod and go.sum

* chore: update docker actions to latest versions

* build: optimize Go build process with caching

* test: trigger build on PR to test

* test: dummy change on go code to test cache

* test: run go mod -u=patch to measure how docker holds

* Revert "test: dummy change on go codeto confirm that cache still works"

* Revert "test: run go mod -u=patch to measure how docker holds"

This reverts commit 92df7a5.

* Revert "test: trigger build on PR to test"

This reverts commit 0d0d452.

.github/workflows/release.yml

@@ -24,14 +24,14 @@ jobs:
           echo ${{ env.RELEASE_VERSION }}
 
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v2
+        uses: docker/setup-qemu-action@v3
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
 
       - name: Extract metadata (tags, labels) for Docker
         id: meta
-        uses: docker/metadata-action@v4
+        uses: docker/metadata-action@v5
         with:
           images: flashbots/mev-boost-relay
           tags: |
@@ -41,13 +41,24 @@ jobs:
             type=raw,value=latest,enable=${{ !contains(env.RELEASE_VERSION, '-') }}
 
       - name: Login to DockerHub
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
+      - name: Go Build Cache for Docker
+        uses: actions/cache@v3
+        with:
+          path: go-build-cache
+          key: ${{ runner.os }}-go-build-cache-${{ hashFiles('**/go.sum') }}
+
+      - name: inject go-build-cache into docker
+        uses: reproducible-containers/[email protected]
+        with:
+          cache-source: go-build-cache
+
       - name: Build and push
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v5
         with:
           context: .
           push: true
@@ -56,6 +67,8 @@ jobs:
           platforms: linux/amd64,linux/arm64
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
 
   github-release:
     runs-on: ubuntu-latest

Dockerfile

@@ -4,8 +4,7 @@ ARG VERSION
 WORKDIR /build
 
 # Cache for the modules
-COPY go.mod ./
-COPY go.sum ./
+COPY go.mod go.sum ./
 RUN --mount=type=cache,target=/root/.cache/go-build go mod download
 
 # Now adding all the code and start building