ci(release): add workflow_dispatch with tag input

Lets maintainers manually (re)build release artifacts for a given tag
when the release: published run failed to upload assets. The checkout
ref falls back to the dispatch input when no release event is present.

Author: cpcloud

.github/workflows/release.yml

@@ -6,6 +6,12 @@ name: Release Artifacts
 on:
   release:
     types: [published]
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: "Release tag to (re)build artifacts for (e.g. v2.6.0)"
+        required: true
+        type: string
 
 concurrency:
   group: release-artifacts
@@ -32,7 +38,7 @@ jobs:
 
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
-          ref: ${{ github.event.release.tag_name }}
+          ref: ${{ github.event.release.tag_name || inputs.tag }}
           fetch-depth: 0
           persist-credentials: false