dockerfile: use dockerx to cache local modules

Author: fridrik01

CLAUDE.md

@@ -51,8 +51,16 @@ BeaconKit is a modular consensus client implementation that uses a modified Come
 make build                    # Build beacond binary to build/bin/beacond
 make build-docker            # Build Docker image
 make install                 # Install beacond to $GOPATH/bin
+make clean-docker            # Clean up Docker BuildX builder and cache
 ```
 
+**Docker BuildX Requirements:**
+- The `build-docker` target uses Docker BuildX for persistent caching and improved build performance
+- BuildX is included in Docker Desktop and Docker Engine 19.03+
+- The build process automatically creates a persistent builder instance named `beaconkit-builder`
+- This builder maintains cached Go modules and build artifacts across builds
+- To remove the builder and clear cache, run `make clean-docker`
+
 ### Running
 ```bash
 make start                   # Start ephemeral devnet node (chain ID: 80087)
@@ -723,7 +731,7 @@ func ProvideBlockchainService(
 
 ### Dependencies
 - Go 1.25.3+
-- Docker (for running EL clients)
+- Docker 19.03+ with BuildX (for Docker builds and running EL clients)
 - Foundry (for Solidity contracts)
 - Make (GNU Make)
 

Dockerfile

@@ -27,23 +27,7 @@ ARG DB_BACKEND=pebbledb
 ARG CMD_PATH=./cmd/beacond
 
 #######################################################
-###         Stage 1 - Cache Go Modules              ###
-#######################################################
-
-FROM golang:${GO_VERSION}-alpine AS mod-cache
-
-WORKDIR /workdir
-
-RUN apk add --no-cache git
-
-# Download Go modules
-COPY ./go.mod ./go.sum ./
-RUN --mount=type=cache,target=/root/.cache/go-build \
-    --mount=type=cache,target=/root/go/pkg/mod \
-    go mod download
-
-#######################################################
-###         Stage 2 - Build the Application         ###
+###         Stage 1 - Build the Application         ###
 #######################################################
 
 FROM golang:${GO_VERSION}-alpine AS builder
@@ -55,13 +39,16 @@ ARG BUILD_TAGS
 # Set the working directory
 WORKDIR /workdir
 
-# Consolidate RUN commands to reduce layers
+# Install dependencies
 RUN apk add --no-cache --update \
     ca-certificates \
     build-base
 
-# Copy the dependencies from the cache stage
-COPY --from=mod-cache /go/pkg /go/pkg
+COPY go.mod go.sum ./
+
+# Download dependencies with cache mount - this will use buildx cache
+RUN --mount=type=cache,target=/go/pkg/mod \
+    go mod download
 
 # Copy all the source code (this will ignore files/dirs in .dockerignore)
 COPY ./ ./
@@ -72,9 +59,9 @@ ARG APP_NAME
 ARG DB_BACKEND
 ARG CMD_PATH
 
-# Build beacond
+# Build beacond with cache mounts
 RUN --mount=type=cache,target=/root/.cache/go-build \
-    --mount=type=cache,target=/root/go/pkg/mod \
+    --mount=type=cache,target=/go/pkg/mod \
     env NAME=${NAME} DB_BACKEND=${DB_BACKEND} APP_NAME=${APP_NAME} CGO_ENABLED=1 && \
     go build \
     -mod=readonly \
@@ -91,7 +78,7 @@ RUN --mount=type=cache,target=/root/.cache/go-build \
     ${CMD_PATH}
 
 #######################################################
-###        Stage 3 - Prepare the Final Image        ###
+###        Stage 2 - Prepare the Final Image        ###
 #######################################################
 
 FROM ${RUNNER_IMAGE}
@@ -110,4 +97,4 @@ RUN mkdir -p /root/jwt /root/kzg && \
 EXPOSE 26656
 EXPOSE 26657
 
-ENTRYPOINT [ "beacond" ]
+ENTRYPOINT [ "beacond" ]

scripts/build/build.mk

@@ -100,9 +100,17 @@ IMAGE_NAME ?= $(TESTAPP)
 # Docker Paths
 DOCKERFILE = ./Dockerfile
 
-build-docker: ## build a docker image containing `beacond`
+# Create buildx builder if it doesn't exist
+.PHONY: docker-builder-setup
+docker-builder-setup:
+	@docker buildx inspect beaconkit-builder 2>/dev/null || \
+		docker buildx create --name beaconkit-builder --driver docker-container
+	@docker buildx use beaconkit-builder
+
+build-docker: docker-builder-setup ## build a docker image containing `beacond`
 	@echo "Build a release docker image for the Cosmos SDK chain..."
-	docker build \
+	docker buildx build \
+	--load \
 	--platform linux/$(ARCH) \
 	--build-arg GIT_COMMIT=$(shell git rev-parse HEAD) \
 	--build-arg GIT_VERSION=$(VERSION) \
@@ -117,3 +125,8 @@ push-docker-github: ## push the docker image to the ghcr registry
 	@echo "Push the release docker image to the ghcr registry..."
 	docker tag $(IMAGE_NAME):$(VERSION) ghcr.io/berachain/beacon-kit:$(VERSION)
 	docker push ghcr.io/berachain/beacon-kit:$(VERSION)
+
+clean-docker: ## clean up docker builder and cache
+	@echo "Removing beaconkit-builder and clearing cache..."
+	@docker buildx rm beaconkit-builder || true
+	@echo "Docker builder cleanup complete"