ci: push images to docker.io for storage conservation

.github/workflows/build.yml

@@ -19,7 +19,7 @@ concurrency:
   cancel-in-progress: true
   
 env:
-  REGISTRY: ghcr.io
+  REGISTRY: docker.io
 jobs:
   Build:
     permissions: write-all
@@ -349,12 +349,12 @@ jobs:
           ls .
           ls bin/
 
-      - name: login to ghcr.io
+      - name: login to docker REGISTRY
         uses: docker/login-action@v3
         with:
-          registry: ghcr.io
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
+          registry: ${{ env.REGISTRY }}
+          username: ${{ secrets.DOCKER_HUB_USER }}
+          password: ${{ secrets.DOCKER_HUB_TOKEN }}
 
       # Build and push Docker image with Buildx (don't push on PR)
       # https://github.com/docker/build-push-action