Use caches to share layers

.github/workflows/deploy.yaml

@@ -39,6 +39,7 @@ jobs:
           labels: ${{ steps.meta.outputs.labels }}
           build-args: |
             WINE_FLAVOUR=stable
+          cache-to: type=local,dest=/tmp/buildx-cache,mode=max
 
       - name: Build devel
         uses: docker/build-push-action@v5
@@ -48,6 +49,7 @@ jobs:
           labels: ${{ steps.meta.outputs.labels }}
           build-args: |
             WINE_FLAVOUR=devel
+          cache-from: type=local,src=/tmp/buildx-cache
 
       - name: Build staging
         uses: docker/build-push-action@v5
@@ -57,3 +59,4 @@ jobs:
           labels: ${{ steps.meta.outputs.labels }}
           build-args: |
             WINE_FLAVOUR=staging
+          cache-from: type=local,src=/tmp/buildx-cache

.github/workflows/test.yaml

@@ -1,11 +1,36 @@
+---
 name: Test Docker image
 on:
   - pull_request
 
+permissions:
+  contents: read
+
 jobs:
   build:
     name: Build Docker image
     runs-on: ubuntu-latest
     steps:
-      - name: Build image
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build stable
+        uses: docker/build-push-action@v5
+        with:
+          build-args: |
+            WINE_FLAVOUR=stable
+          cache-to: type=local,dest=/tmp/buildx-cache,mode=max
+
+      - name: Build devel
+        uses: docker/build-push-action@v5
+        with:
+          build-args: |
+            WINE_FLAVOUR=devel
+          cache-from: type=local,src=/tmp/buildx-cache
+
+      - name: Build staging
         uses: docker/build-push-action@v5
+        with:
+          build-args: |
+            WINE_FLAVOUR=staging
+          cache-from: type=local,src=/tmp/buildx-cache