Remove temporary workaround for image auth to ghcr (#155)

When we were setting up the repos, we needed these environment variables
for the GitHub Actions CI to be able to run the tests. Now that the
images are public, these can be removed.

Signed-off-by: Kathryn Baldauf <k_baldauf@apple.com>

.github/workflows/common.yml

@@ -61,9 +61,6 @@ jobs:
           launchctl setenv HTTP_PROXY $HTTP_PROXY
           make test cleancontent install-kernel integration
         env:
-          CONTAINER_REGISTRY_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          CONTAINER_REGISTRY_USER: ${{ github.actor }}
-          CONTAINER_REGISTRY_HOST: ghcr.io
           DEVELOPER_DIR: "/Applications/Xcode_16.3.app/Contents/Developer"
           CURRENT_SDK: y
       - name: Save documentation artifact