of course the names aren't evaluated...

Author: siku2

.github/workflows/deploy.yaml

@@ -12,7 +12,7 @@ jobs:
       - name: Publish latest image
         uses: elgohr/Publish-Docker-Github-Action@master
         with:
-          name: ${GITHUB_REPOSITORY}/slim
+          name: ${{ github.repository }}/slim
           registry: docker.pkg.github.com
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
@@ -21,7 +21,7 @@ jobs:
         name: Publish tagged image
         uses: elgohr/Publish-Docker-Github-Action@master
         with:
-          name: ${GITHUB_REPOSITORY}/slim
+          name: ${{ github.repository }}/slim
           registry: docker.pkg.github.com
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}