ci: rename push job

The previous name was image-build-test which clashed with the image
build test :)

Signed-off-by: Tiago Castro <tiagolobocastro@gmail.com>

Author: tiagolobocastro

.github/workflows/image.yml

@@ -13,7 +13,7 @@ env:
   CI: 1
 
 jobs:
-  image-build-test:
+  image-build-push:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4