Update docker-publish.yml

.github/workflows/docker-publish.yml

@@ -11,7 +11,7 @@ env:
   # This should allow creation of docker images even in forked repositories
   # Image name may not contain uppercase characters, so we can not use the repository name
   # Creates a string like: ghcr.io/SillyTavern/sillytavern
-  image_name: ghcr.io/${{ github.repository_owner }}/sillytavern
+  image_name: ghcr.io/sillytavern/sillytavern
 
 jobs:
 
@@ -20,6 +20,9 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
+      - name: downcase REPO
+        run: |
+          echo "REPO=${GITHUB_REPOSITORY,,}" >>${GITHUB_ENV}
       - name: Checkout
         uses: actions/checkout@v3