speed up docker builds (#92)

Author: mntlty

.github/workflows/docker-publish.yml

@@ -23,7 +23,7 @@ env:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-latest-xl
     permissions:
       contents: read
       packages: write
@@ -67,6 +67,17 @@ jobs:
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
 
+      - name: Go Build Cache for Docker
+        uses: actions/cache@v4
+        with:
+          path: go-build-cache
+          key: ${{ runner.os }}-go-build-cache-${{ hashFiles('**/go.sum') }}
+
+      - name: Inject go-build-cache
+        uses: reproducible-containers/buildkit-cache-dance@4b2444fec0c0fb9dbf175a96c094720a692ef810 # v2.1.4
+        with:
+          cache-source: go-build-cache
+
       # Build and push Docker image with Buildx (don't push on PR)
       # https://github.com/docker/build-push-action
       - name: Build and push Docker image

Dockerfile

@@ -5,13 +5,18 @@ FROM golang:1.23.7 AS build
 ARG VERSION
 # Set the working directory
 WORKDIR /build
-# Copy the current directory contents into the working directory
-COPY . .
+
+RUN go env -w GOMODCACHE=/root/.cache/go-build
+
 # Install dependencies
-RUN go mod download
+COPY go.mod go.sum ./
+RUN --mount=type=cache,target=/root/.cache/go-build go mod download
+
+COPY . ./
 # Build the server
-RUN CGO_ENABLED=0 go build -ldflags="-s -w -X main.version=${VERSION} -X main.commit=$(git rev-parse HEAD) -X main.date=$(date -u +%Y-%m-%dT%H:%M:%SZ)" \
+RUN --mount=type=cache,target=/root/.cache/go-build CGO_ENABLED=0 go build -ldflags="-s -w -X main.version=${VERSION} -X main.commit=$(git rev-parse HEAD) -X main.date=$(date -u +%Y-%m-%dT%H:%M:%SZ)" \
     -o github-mcp-server cmd/github-mcp-server/main.go
+
 # Make a stage to run the app
 FROM gcr.io/distroless/base-debian12
 # Set the working directory