Use registry as cache for Docker layers

This will allow the container build to reutilize layers between
executions and effectively make cargo-chef work.

Author: Athos Couto

.github/workflows/pr-images.yml

@@ -22,6 +22,9 @@ jobs:
         with:
           submodules: recursive
 
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+  
       - name: Log in to the Container registry
         uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
         with:
@@ -42,3 +45,6 @@ jobs:
           push: true
           tags: ${{ steps.meta.outputs.tags }}-${{ github.event.pull_request.head.sha }}
           labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=registry,ref=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:buildcache
+          cache-to: type=registry,ref=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:buildcache,mode=max
+

.github/workflows/publish.yml

@@ -24,6 +24,9 @@ jobs:
         with:
           submodules: recursive
 
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
       - name: Log in to the Container registry
         uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
         with:
@@ -44,3 +47,5 @@ jobs:
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=registry,ref=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:buildcache
+          cache-to: type=registry,ref=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:buildcache,mode=max