Add .gitleaks.toml to avoid detecting leaks on test files

Author: gsmet

.gitleaks.toml

@@ -0,0 +1,8 @@
+[allowlist]
+  description = "Global Allowlist"
+
+  # Ignore based on any subset of the file path
+  paths = [
+    # Ignore all test files
+    '''**/src/test/**''',
+  ]