ci: run tests on plain runner, drop unpublished ci image

Author: axelmarciano

.github/workflows/push.yml

@@ -36,12 +36,6 @@ jobs:
   test:
     runs-on: ubuntu-latest
 
-    container:
-      image: ghcr.io/mercuretechnologies/expo-open-ota-ci:latest
-      credentials:
-        username: axelmarciano
-        password: ${{  secrets.DOCKER_GITHUB_CONTAINER_REGISTRY_TOKEN }}
-
     steps:
       - name: Checkout code
         uses: actions/checkout@v4