Merge branch 'brew_gitlab' into 'master'

Don't run `brew uninstall` outside of travis-ci

See merge request OpenMW/openmw!771

CI/before_install.osx.sh

@@ -1,9 +1,9 @@
 #!/bin/sh -ex
 
 # workaround python issue on travis
-HOMEBREW_NO_AUTO_UPDATE=1 brew uninstall --ignore-dependencies python@3.8 || true
-HOMEBREW_NO_AUTO_UPDATE=1 brew uninstall --ignore-dependencies python@3.9 || true
-HOMEBREW_NO_AUTO_UPDATE=1 brew uninstall --ignore-dependencies qt@6 || true
+[-z "${TRAVIS}"] && HOMEBREW_NO_AUTO_UPDATE=1 brew uninstall --ignore-dependencies python@3.8 || true
+[-z "${TRAVIS}"] && HOMEBREW_NO_AUTO_UPDATE=1 brew uninstall --ignore-dependencies python@3.9 || true
+[-z "${TRAVIS}"] && HOMEBREW_NO_AUTO_UPDATE=1 brew uninstall --ignore-dependencies qt@6 || true
 
 # Some of these tools can come from places other than brew, so check before installing
 command -v ccache >/dev/null 2>&1 || brew install ccache