Fix manual release ref handling

.github/workflows/release.yml

@@ -2,6 +2,11 @@ name: Release
 
 on:
   workflow_dispatch:
+    inputs:
+      release_ref:
+        description: "Git ref to release, preferably a tag like v1.0.1"
+        required: true
+        type: string
   push:
     tags:
       - "v*"
@@ -17,6 +22,7 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
+          ref: ${{ github.event_name == 'workflow_dispatch' && github.event.inputs.release_ref || github.ref }}
 
       - name: Setup Go
         uses: actions/setup-go@v5