Try logging in as repository_owner

Author: bthomee

.github/workflows/ubuntu.yml

@@ -22,7 +22,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
       - name: Login to GitHub Container Registry
-        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ${DOCKER_REGISTRY} -u ${{ github.actor }} --password-stdin
+        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ${DOCKER_REGISTRY} -u ${{ github.repository_owner }} --password-stdin
       - name: Determine the Docker image name.
         run: |
           # Convert the repository name to lowercase as the organization name is
@@ -59,7 +59,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
       - name: Login to GitHub Container Registry
-        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ${DOCKER_REGISTRY} -u ${{ github.actor }} --password-stdin
+        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ${DOCKER_REGISTRY} -u ${{ github.repository_owner }} --password-stdin
       - name: Determine the Docker image name.
         run: |
           # Convert the repository name to lowercase as the organization name is