feat: update Dockerfile.local-da and docker-compose for local-da image build and caching

Author: randygrok

.github/integration-tests/docker-compose.yml

@@ -1,10 +1,6 @@
 services:
   local-da:
-    build:
-      context: ../..
-      dockerfile: .github/integration-tests/docker/Dockerfile.local-da
-      args:
-        EV_DA_REF: ${EVNODE_DA_VERSION:-v1.0.0-beta.1}
+    image: local-da:latest
     container_name: rollkit-local-da
     command: ["local-da", "-listen-all"]
     ports:

.github/integration-tests/docker/Dockerfile.local-da

@@ -1,13 +1,14 @@
 # Build local-da from ev-node source
 FROM golang:1.24-alpine AS builder
 
-# Install build dependencies
+# Install build dependencies - this layer will be cached
 RUN apk add --no-cache gcc musl-dev git
 
 # Set working directory
 WORKDIR /workspace
 
 # Build local-da from rollkit module at the requested version (tag/branch/pseudo-version)
+# This layer will be cached if EV_DA_REF doesn't change
 ARG EV_DA_REF=main
 RUN GOBIN=/workspace go install github.com/rollkit/rollkit/da/cmd/local-da@${EV_DA_REF}
 

.github/workflows/attester-mode-integration-test.yml

@@ -25,6 +25,21 @@ jobs:
         with:
           fetch-depth: 0
 
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build and cache local-da image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: .github/integration-tests/docker/Dockerfile.local-da
+          tags: local-da:latest
+          load: true
+          build-args: |
+            EV_DA_REF=${{ env.EVNODE_DA_VERSION }}
+          cache-from: type=gha,scope=local-da
+          cache-to: type=gha,mode=max,scope=local-da
+
       - name: Run integration tests (compose orchestrator)
         env:
           VERBOSE: "true"