fix tag name

Signed-off-by: cpanato <[email protected]>

Author: cpanato

.github/workflows/release.yml

@@ -67,7 +67,7 @@ jobs:
 
       - name: sign image
         run: |
-          DIGEST=$(crane digest ghcr.io/cpanato/github_actions_exporter:${{ steps.get_tag.outputs.TAG }})
+          DIGEST=$(crane digest ghcr.io/cpanato/github_actions_exporter:${{ steps.tag.outputs.tag_name }})
           cosign sign "ghcr.io/cpanato/github_actions_exporter@${DIGEST}"
         env:
           COSIGN_YES: "true"