issue(#3): fix push ghcr.io failed issue

.github/workflows/push-image.yml

@@ -9,7 +9,7 @@ on:
   push:
     tags:
       - v[0-9]+.*
-      
+
 permissions:
   contents: read
   packages: write
@@ -43,10 +43,7 @@ jobs:
         pack builder create builder --config builder.toml
 
     - name: Set environment variable
-      run: echo "IMAGE_NAME=ghcr.io/amp-buildpacks/leo-builder" >> $GITHUB_ENV
-
-    - name: Set up Docker Buildx
-      uses: docker/setup-buildx-action@v3
+      run: echo "IMAGE_NAME=ghcr.io/${{ github.repository }}" >> $GITHUB_ENV
 
     - name: Login to GitHub Container Registry
       uses: docker/login-action@v3
@@ -61,14 +58,13 @@ jobs:
       with:
         images: ${{ env.IMAGE_NAME }}
 
-    - name: Build and push by digest
-      id: build
-      uses: docker/build-push-action@v5
-      with:
-        context: .
-        tags: ${{ steps.meta.outputs.tags }}
-        labels: ${{ steps.meta.outputs.labels }}
-        outputs: type=image,name=${{ env.IMAGE_NAME }},push-by-digest=true,name-canonical=true,push=true
-        provenance: false
-        cache-from: type=gha
-        cache-to: type=gha
+    - name: Push To ghcr.io
+      run: |
+        registry_uri="ghcr.io"
+        registry_repo="${{ github.repository }}"
+
+        docker tag builder "${registry_uri}/${registry_repo}:latest"
+        docker tag builder "${registry_uri}/${registry_repo}:${{ steps.event.outputs.tag }}"
+
+        docker push "${registry_uri}/${registry_repo}:latest"
+        docker push "${registry_uri}/${registry_repo}:${{ steps.event.outputs.tag }}"