Merge pull request mruby#6563 from jbampton/rubocop-indentation

Author: matz

.github/linters/.rubocop.yml

@@ -0,0 +1,7 @@
+AllCops:
+  DisabledByDefault: true
+  TargetRubyVersion: 3.4.0
+
+Layout/IndentationStyle:
+  Enabled: true
+  EnforcedStyle: spaces

.pre-commit-config.yaml

@@ -108,6 +108,14 @@ repos:
         args: [--config=.github/linters/mlc_config.json, -q]
         types: [markdown]
         files: \.md$
+  - repo: https://github.com/rubocop/rubocop
+    rev: v1.77.0
+    hooks:
+      - id: rubocop
+        name: run rubocop
+        description: RuboCop is a Ruby code style checker (linter) and formatter based on the community-driven Ruby Style Guide
+        exclude: ^test/t/syntax\.rb$
+        args: [--config=.github/linters/.rubocop.yml]
   - repo: https://github.com/shellcheck-py/shellcheck-py
     rev: v0.10.0.1
     hooks: