Set default git identity inside Docker runner

Configure a global git user.name and user.email in the local Docker
entrypoint when they are missing.

This makes local container runs behave more like GitHub CI for tests
that create commits, while still allowing overrides via existing git
config or UNITTESTING_GIT_USER_NAME/UNITTESTING_GIT_USER_EMAIL.

Author: kaste

docker/entrypoint.sh

@@ -7,7 +7,20 @@ set -e
 PATH="$HOME/.local/bin:$PATH"
 BOOTSTRAP_MARKER="$HOME/.cache/unittesting/bootstrap.done"
 
+ensure_git_identity() {
+    # Align local container behavior with typical CI runners where git
+    # identity is configured for tests that create commits.
+    if ! git config --global user.name >/dev/null 2>&1; then
+        git config --global user.name "${UNITTESTING_GIT_USER_NAME:-UnitTesting CI}"
+    fi
+
+    if ! git config --global user.email >/dev/null 2>&1; then
+        git config --global user.email "${UNITTESTING_GIT_USER_EMAIL:-unittesting@example.invalid}"
+    fi
+}
+
 sudo sh -e /etc/init.d/xvfb start
+ensure_git_identity
 
 UNITTESTING_SOURCE=${UNITTESTING_SOURCE:-/unittesting}
 SUBLIME_TEXT_VERSION=${SUBLIME_TEXT_VERSION:-4}