Fix default archive commands for PRs (#10)

Fix invalid use of `github.ref_name` which points to `main` and not the
pull request branch on `delete` events. We now correctly set the label
as `github.event.ref_name` which points to the branch.

.github/workflows/ci.yaml

@@ -198,4 +198,6 @@ jobs:
           breaking: false
           push: false
           archive: true
+          # On push github.ref_name, on delete github.event.ref_name.
+          archive_labels: ${{ github.ref_name }}
           comment: false

action.yml

@@ -197,7 +197,7 @@ inputs:
             label2
     required: false
     default: |
-      ${{ github.ref_name }}
+      ${{ github.event.ref_name }}
 
 runs:
   using: "node20"