chore(ci): enable caching

.github/workflows/docker-build.yml

@@ -46,6 +46,7 @@ jobs:
           push: true
           tags: git.dominikstahl.dev/${{ env.REPO }}:${{ steps.get-ref.outputs.tag}}
           cache-from: type=registry,ref=git.dominikstahl.dev/${{ env.REPO }}:buildcache
+          cache-to: type=registry,ref=git.dominikstahl.dev/${{ env.REPO }}:buildcache,mode=max
 
       - name: Build and push (push_tag)
         uses: docker/build-push-action@14487ce63c7a62a4a324b0bfb37086795e31c6c1 # v6
@@ -54,6 +55,7 @@ jobs:
           push: true
           tags: git.dominikstahl.dev/${{ env.REPO }}:${{ steps.get-ref.outputs.tag }},git.dominikstahl.dev/${{ env.REPO }}:latest
           cache-from: type=registry,ref=git.dominikstahl.dev/${{ env.REPO }}:buildcache
+          cache-to: type=registry,ref=git.dominikstahl.dev/${{ env.REPO }}:buildcache,mode=max
 
       - name: Build and push (push_branch)
         uses: docker/build-push-action@14487ce63c7a62a4a324b0bfb37086795e31c6c1 # v6