fix wrong tag in nightly releases

Author: Samueru-sama

.github/workflows/nightly.yml

@@ -116,7 +116,7 @@ jobs:
         uses: softprops/action-gh-release@v2
         with:
           name: "Azahar AppImage Nightly ${{ env.APP_VERSION }}"
-          tag_name: "${{ env.APP_VERSION }}"
+          tag_name: "nightly"
           prerelease: true
           draft: false
           generate_release_notes: false