feat(cache): use mode=max for faster builds

.github/workflows/buildx.yml

@@ -71,6 +71,9 @@ jobs:
       - uses: docker/setup-qemu-action@v1
       - uses: docker/setup-buildx-action@v1
         with:
+          # TODO: remove the digest pinning after changes from https://github.com/moby/buildkit/pull/2506 are published (probably after v0.9.3)
+          driver-opts: |
+            image=moby/buildkit:master@sha256:b8d8458bbab41b575614801826d3e0f50e93d8730aaf68431713e3bdb4378744
           config-inline: |
             [registry."docker.io"]
               mirrors = ["mirror.gcr.io"]

images/alpine/config.js

@@ -27,7 +27,7 @@ const variant = (version, alpine, override = (s) => s) =>
       'linux/ppc64le',
       'linux/s390x',
     ],
-    cacheScope: `alpine-${alpine}`
+    cacheScope: `alpine-${alpine}-${version}`
   })
 
 module.exports = {

images/debian/config.js

@@ -28,7 +28,7 @@ const variant = (version, debian, override = (s) => s) =>
       'linux/ppc64le',
       'linux/s390x', // fails to install runtime dependencies
     ],
-    cacheScope: `debian-${debian}`
+    cacheScope: `debian-${debian}-${version}`
   })
 
 module.exports = {

images/shared.js

@@ -19,7 +19,7 @@ const matrixEntryConverter = ({ context, file }, overrides = {}) => async (
         .join('\n'),
       paltforms: build.platforms.join(','),
       cacheFrom: `type=gha,scope=${build.cacheScope}`,
-      cacheTo: `type=gha,scope=${build.cacheScope}`,
+      cacheTo: `type=gha,mode=max,scope=${build.cacheScope}`,
       tags: build.fullTags.join('\n'),
     },
   }