chore: suppress warnings about default branch

tests/unit/nginx-vhosts_12.bats

@@ -27,6 +27,11 @@ teardown() {
   echo "status: $status"
   assert_success
 
+  run /bin/bash -c "git config --global init.defaultBranch master"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
   run /bin/bash -c "git init"
   echo "output: $output"
   echo "status: $status"

tests/unit/test_helper.bash

@@ -326,6 +326,7 @@ deploy_app() {
   pushd "$TMP" &>/dev/null || exit 1
   [[ -z "$CUSTOM_TMP" ]] && trap 'popd &>/dev/null || true; rm -rf "$TMP"' RETURN INT TERM
 
+  git config --global init.defaultBranch master
   git init
   git config user.email "robot@example.com"
   git config user.name "Test Robot"