CI: cache build artifacts and configs

.github/workflows/main.yml

@@ -16,10 +16,12 @@ env:
   TARGET_PLATFORM: linux-x64
   WYLAB_SOURCE_REPO: https://git.wylab.me/wylab/wylab-station-14.git
   WYLAB_SOURCE_REF: master
+  BUILD_CACHE_SCOPE: ws14-docker-linux-server
 
 jobs:
   build-and-push-image:
     runs-on: ubuntu-latest
+    timeout-minutes: 240
     permissions:
       contents: read
       packages: write
@@ -65,6 +67,10 @@ jobs:
         with:
           context: .
           platforms: linux/amd64
+          cache-from: |
+            type=gha,scope=${{ env.BUILD_CACHE_SCOPE }}
+          cache-to: |
+            type=gha,scope=${{ env.BUILD_CACHE_SCOPE }},mode=max,compression=zstd
           push: true
           tags: |
             ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest