try build again

it failed here:
https://github.com/kingdon-ci/flux-docs/actions/runs/8681095039/job/23803128471#step:9:24

(env.REPOSITORY was unset)

Signed-off-by: Kingdon Barrett <[email protected]>

Author: kingdonb

.github/workflows/deploy.yml

@@ -52,7 +52,7 @@ jobs:
           registry: ghcr.io
           registry_username: ${{ github.actor }}
           registry_password: ${{ secrets.GITHUB_TOKEN }}
-          registry_reference: "ghcr.io/${{ env.REPOSITORY }}/build:${{ github.run_id }}-2"
+          registry_reference: "ghcr.io/kingdon-ci/flux-docs/build:${{ github.run_id }}-2"
           manifest_file: spin.toml
 
       - name: Deploy and push OCI