ci: fix release workflow

Author: ggguardian

.github/workflows/release.yaml

@@ -139,8 +139,7 @@ jobs:
         id: sign
         uses: ./.github/actions/cosign
         with:
-          image: '${{ steps.github.outputs.repository }}'
-          tag: ${{ steps.github.outputs.version }}${{ matrix.tag-suffix }}
+          image: 'ghcr.io/${{ steps.github.outputs.repository }}:${{ steps.github.outputs.version }}${{ matrix.tag-suffix }}'
           attest-provenance: 'true'
 
       - name: Copy image to DockerHub