fix CI not setting executable permission to mac binary (#22)

Author: umbynos

.github/workflows/release.yml

@@ -86,6 +86,9 @@ jobs:
       - name: Re-package binary and update checksum
         # Repackage the signed binary replaced in place by Gon (ignoring the output zip file)
         run: |
+          # GitHub's upload/download-artifact@v2 actions don't preserve file permissions,
+          # so we need to add execution permission back.
+          chmod +x dist/macos64/FirmwareUploader
           TAG=${GITHUB_REF/refs\/tags\//}
           tar cjf dist/FirmwareUploader_${TAG}_macOS_64bit.tar.bz2 \
           firmwares \