Fix release workflow

"workflow_call" is not a event name

.github/workflows/appimage.yml

@@ -17,6 +17,9 @@ on:
         type: string
         description: 'The suffix of the version, including dash'
         required: true
+      upload-to-draft:
+        type: boolean
+        default: true
     outputs:
       sha256-appimage-x64:
         description: "SHA256 sum of the x64 appimage"
@@ -216,7 +219,7 @@ jobs:
             cryptomator-*.asc
           if-no-files-found: error
       - name: Publish AppImage on GitHub Releases
-        if: github.event_name == 'workflow_call'
+        if: inputs.upload-to-draft
         uses: softprops/action-gh-release@153bb8e04406b158c6c84fc1615b65b24149a1fe # v2.6.1
         with:
           draft: true
@@ -231,7 +234,7 @@ jobs:
     name: Collect AppImage checksums
     runs-on: ubuntu-latest
     needs: [build]
-    if: github.event_name == 'workflow_call'
+    if: inputs.upload-to-draft
     outputs:
       x64-sha256sum: ${{ steps.sha256sum.outputs.x64-sha256sum }}
       aarch64-sha256sum: ${{ steps.sha256sum.outputs.aarch64-sha256sum }}