ci: support upload_tag input on workflow_dispatch

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/release.yml

@@ -4,6 +4,10 @@ on:
   release:
     types: [published]
   workflow_dispatch:
+    inputs:
+      upload_tag:
+        description: 'Release tag to upload assets to (e.g. v0.1.6)'
+        required: false
 
 jobs:
   build-flatpak:
@@ -104,11 +108,12 @@ jobs:
           mv H7CAD*.AppImage H7CAD.AppImage
 
       - name: Upload AppImage to release
-        if: github.event_name == 'release'
+        if: github.event_name == 'release' || inputs.upload_tag != ''
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
-          gh release upload ${{ github.ref_name }} H7CAD.AppImage --clobber --repo ${{ github.repository }}
+          TAG=${{ github.event_name == 'release' && github.ref_name || inputs.upload_tag }}
+          gh release upload $TAG H7CAD.AppImage --clobber --repo ${{ github.repository }}
 
   build-windows:
     runs-on: windows-latest