[ansibletest] Add a branch for the git repo

The allows for setting the POD_ANSIBLE_GIT_BRANCH var to specify which branch to check out.

The default behaviour is preserved i.e. clone the repo and use the default branch
When the new env var is set, the specified branch is checked out in the cloned repo.

Author: elfiesmelfie

container-images/tcib/base/ansible-tests/run_ansible.sh

@@ -7,6 +7,7 @@ ANSIBLE_FILE_EXTRA_VARS_PARAM="${ANSIBLE_FILE_EXTRA_VARS_PARAM:-}"
 POD_ANSIBLE_PLAYBOOK="${POD_ANSIBLE_PLAYBOOK:-}"
 POD_ANSIBLE_EXTRA_VARS="${POD_ANSIBLE_EXTRA_VARS:-}"
 POD_ANSIBLE_GIT_REPO="${POD_ANSIBLE_GIT_REPO:-}"
+POD_ANSIBLE_GIT_BRANCH="${POD_ANSIBLE_GIT_BRANCH:-}"
 
 # Check and set ansible debug verbosity
 ANSIBLE_DEBUG=""
@@ -17,6 +18,12 @@ fi
 # Clone the Ansible repository
 git clone "$POD_ANSIBLE_GIT_REPO" "$ANSIBLE_DIR"
 
+if [[ -n "$POD_ANSIBLE_GIT_BRANCH" ]]; then
+    pushd "$ANSIBLE_DIR"
+    git fetch && git checkout --track origin/${POD_ANSIBLE_GIT_BRANCH}
+    popd
+fi
+
 # Handle extra vars file if provided
 if [[ -n "${POD_ANSIBLE_FILE_EXTRA_VARS:-}" ]]; then
     echo "$POD_ANSIBLE_FILE_EXTRA_VARS" > "$ANSIBLE_DIR/extra_vars.yaml"