Do not build a multi-platform image at the stage where we load it to obtain the version number

Author: mpdude

.github/workflows/build.yml

@@ -31,7 +31,6 @@ jobs:
             -   name: Build and cache multi-platform image
                 uses: docker/build-push-action@v6
                 with:
-                    platforms: linux/amd64,linux/arm64
                     cache-from: type=gha
                     cache-to: type=gha,mode=max
                     load: true
@@ -57,6 +56,7 @@ jobs:
                 with:
                     platforms: linux/amd64,linux/arm64
                     cache-from: type=gha
+                    cache-to: type=gha,mode=max
                     push: true
                     tags: |
                         ghcr.io/webfactory/alpine-chromium:latest