Add create-dmg utility installation

Author: vit9696

.github/workflows/main.yml

@@ -49,6 +49,7 @@ jobs:
           codesign -fs - UEFIFind/UEFIFind
           zip -qryj ../UEFITool/dist/UEFIExtract_NE_${UEFITOOL_VER}_universal_mac.zip ./UEFIExtract/UEFIExtract
           zip -qryj ../UEFITool/dist/UEFIFind_NE_${UEFITOOL_VER}_universal_mac.zip ./UEFIFind/UEFIFind
+          brew install create-dmg || exit 1
           curl -OL "https://github.com/acidanthera/ocbuild/raw/master/codesign/appsign.sh" || exit 1
           chmod a+x appsign.sh || exit 1
           "$(pwd)/appsign.sh" ./UEFITool/UEFITool.app ../UEFITool/dist/UEFITool_NE_${UEFITOOL_VER}_universal_mac.dmg