fix(release): docker repository cannot contain dashes

Author: pandatix

.github/workflows/docker.yaml

@@ -30,7 +30,7 @@ jobs:
         id: meta
         uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81 # v5.5.1
         with:
-          images: ${{ github.repository }}
+          images: ctferio/ctfd-setup
 
       - name: Build and push Docker image
         uses: docker/build-push-action@4f58ea79222b3b9dc2c8bbdd6debcef730109a75 # v6.9.0
@@ -52,7 +52,7 @@ jobs:
     if: startsWith(github.ref, 'refs/tags/')
     uses: slsa-framework/slsa-github-generator/.github/workflows/generator_container_slsa3.yml@v2.0.0
     with:
-      image: ${{ github.repository }}
+      image: ctferio/ctfd-setup
       digest: ${{ needs.docker.outputs.digest }}
     secrets:
       registry-username: ${{ secrets.DOCKERHUB_USERNAME }}