Fixup build cache

Author: williamdes

.github/workflows/publish.yml

@@ -43,6 +43,9 @@ jobs:
             - name: Build and push image
               run: make docker-build
               env:
+                  # See: https://stackoverflow.com/a/68459169/5155484
+                  # Cache the final image
+                  BUILDKIT_INLINE_CACHE: 1
                   DOCKER_BUILDKIT: 1
                   BUILDKIT_MULTI_PLATFORM: "false"
                   PLATFORM: ${{ matrix.platform }}