feat: update attester Dockerfile and integration test workflow for improved image building and caching

Author: randygrok

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

@@ -75,9 +75,7 @@ services:
 
   # Attester service
   attester:
-    build:
-      context: ../..
-      dockerfile: .github/integration-tests/docker/Dockerfile.attester
+    image: attester:latest
     container_name: gm-attester
     volumes:
       - ../integration-tests/scripts:/home/attester/scripts:ro

.github/integration-tests/docker/Dockerfile.attester

@@ -1,23 +1,24 @@
 FROM golang:1.24-alpine as builder
 
-# Install dependencies
+# Install system dependencies - this layer will be cached
 RUN apk add --no-cache git make gcc musl-dev
 
 # Set working directory
 WORKDIR /workspace
 
-# Copy ev-abci (repo root) and the scaffolded gm chain
+# Copy ev-abci source code
 COPY . /workspace/ev-abci
-# Ensure attester sources are present (attester/main.go, etc.)
-COPY attester /workspace/ev-abci/attester
+
 # Build the attester binary (it has its own go.mod)
 WORKDIR /workspace/ev-abci/attester
-## Align module replacements and fetch deps
-# attester lives at /workspace/ev-abci/attester, so the ev-abci root is one level up
+
+# Align module replacements and fetch deps - cached if dependencies don't change
 RUN go mod edit -dropreplace github.com/evstack/ev-abci || true \
     && go mod edit -replace github.com/evstack/ev-abci=.. \
     && go mod edit -dropreplace github.com/evstack/ev-node || true \
     && go mod tidy
+
+# Build attester binary - rebuilds only if source code changes
 RUN go build -o /workspace/attester .
 
 # Runtime stage

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

@@ -54,6 +54,16 @@ jobs:
           cache-from: type=gha,scope=gm-chain
           cache-to: type=gha,mode=max,scope=gm-chain
 
+      - name: Build and cache attester image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: .github/integration-tests/docker/Dockerfile.attester
+          tags: attester:latest
+          load: true
+          cache-from: type=gha,scope=attester
+          cache-to: type=gha,mode=max,scope=attester
+
       - name: Run integration tests (compose orchestrator)
         env:
           VERBOSE: "true"