Mark the repo as safe for Git

This relates to actions/checkout#760

Some tests need git to be functional (eg pre-commit checks) and since
CVE-2022-24765 git checks directory ownership.

Merges #55

Co-authored-by: Miro Hrončok <miro@hroncok.cz>
Co-authored-by: Lumir Balhar <lbalhar@redhat.com>

Author: 3 people

run_tests.sh

@@ -13,4 +13,7 @@ if [ ! -z "$DNF_INSTALL" ]; then
     dnf -y --setopt=tsflags=nodocs --setopt=deltarpm=false install $DNF_INSTALL
 fi
 
+# Mark the current directory as safe for Git:
+git --git-dir=~ config --system --add safe.directory $PWD
+
 /usr/bin/tox $TOX_PARAMS