CI: OSX Set builds to stable on tagged builds

CI/before-deploy-osx.sh

@@ -21,7 +21,12 @@ mv ./rundir/RelWithDebInfo/obs-plugins/obs-browser.so ./
 
 # Package everything into a nice .app
 hr "Packaging .app"
-sudo python ../CI/install/osx/build_app.py --public-key ../CI/install/osx/OBSPublicDSAKey.pem --sparkle-framework ../../sparkle/Sparkle.framework #--base-url=https://obsappcasturlhere
+STABLE=False
+if [ -n "${TRAVIS_TAG}" ]; then
+  STABLE=TRUE
+fi
+
+sudo python ../CI/install/osx/build_app.py --public-key ../CI/install/osx/OBSPublicDSAKey.pem --sparkle-framework ../../sparkle/Sparkle.framework --base-url "https://obsproject.com/osx_update" --stable $STABLE
 
 # Move the CEF plugin back to where it belongs
 hr "Moving CEF back"