Update docker-ghcr.yml

docker image needs to be lowercase in workflow

Author: reprodev

.github/workflows/docker-ghcr.yml

@@ -35,7 +35,7 @@ jobs:
         id: meta
         uses: docker/metadata-action@v5
         with:
-          images: ghcr.io/reprodev/Capo2Keys
+          images: ghcr.io/reprodev/capo2keys
           tags: |
             type=sha,prefix=sha-
             type=ref,event=branch