Always use github.repository_owner as this is the user corresponding to secrets.PAT_TOKEN as well

Author: mering

.github/workflows/test.yml

@@ -26,7 +26,7 @@ jobs:
         uses: docker/login-action@v2
         with:
           registry: ghcr.io
-          username: ${{ github.actor }}
+          username: ${{ github.repository_owner }}
           password: ${{ secrets.PAT_TOKEN }}
       - name: lower case repository_owner
         id: lower_case_repository_owner
@@ -59,7 +59,7 @@ jobs:
         uses: docker/login-action@v2
         with:
           registry: ghcr.io
-          username: ${{ github.actor }}
+          username: ${{ github.repository_owner }}
           password: ${{ secrets.PAT_TOKEN }}
       - name: lower case repository_owner
         id: lower_case_repository_owner