performance: set up cache mount for build via Dockerfile

Signed-off-by: squidfunk <martin.donath@squidfunk.com>

.github/workflows/build.yml

@@ -270,15 +270,21 @@ jobs:
     runs-on: ubuntu-latest
     env:
       IMAGE: ${{ github.event.repository.full_name }}
+      DOCKER_BUILDKIT: 1
     steps:
       - name: Checkout repository
         uses: actions/checkout@v5
         with:
           ref: ${{ inputs.ref || github.sha }}
 
+      - name: Set up Buildx
+        uses: docker/setup-buildx-action@v3
+
       - name: Build image
         uses: docker/build-push-action@v6
         with:
           context: .
           load: true
           tags: ${{ env.IMAGE }}:latest
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

Dockerfile

@@ -62,7 +62,10 @@ COPY README.md README.md
 COPY uv.lock uv.lock
 
 # Install dependencies
-RUN uv sync --dev --no-install-project
+RUN --mount=type=cache,target=/root/.cargo/registry \
+    --mount=type=cache,target=/root/.cargo/git \
+    --mount=type=cache,target=/root/.cache/uv \
+    uv sync --dev --no-install-project
 
 # Copy files to build project
 COPY . .