workflow: make AppImage executable

Author: JupiterPi

.github/workflows/build-and-publish.yaml

@@ -30,6 +30,8 @@ jobs:
       - run: npm run build
         env: 
           THYME_VERSION: ${{ github.event.release.tag_name }}
+      - if: ${{ matrix.os == 'ubuntu-latest' }}
+        run: chmod +x releases/*/thyme-*.AppImage
       - name: Rename and move release binaries
         uses: actions/github-script@v7
         with: