Add yamllint pre-commit hook for YAML file standardization (#11017)

* Add yamllint pre-commit hook for YAML file standardization

Add yamllint hook to .pre-commit-config.yaml to standardize YAML files
across the project. Created .yamllint.yml configuration with relaxed
rules to accommodate existing files. Fixed colon spacing in .asf.yaml
to pass yamllint checks.

Closes #10974

Signed-off-by: vanzan01 <vanzan.1250@gmail.com>

* Add extra eol to .yamllint.yml

Address review comment from DaanHoogland

Signed-off-by: vanzan01 <vanzan.1250@gmail.com>

* Move .yamllint.yml to .github/linters/ and improve file pattern

- Move .yamllint.yml to .github/linters/ directory for better organization
- Update pre-commit config to point to new location
- Change file pattern to \.ya?ml$ as suggested

Address review feedback from jbampton

Signed-off-by: vanzan01 <vanzan.1250@gmail.com>

* Update .pre-commit-config.yaml

Co-authored-by: John Bampton <jbampton@users.noreply.github.com>

* Make yamllint more forgiving and exclude only k8s templates

- Remove extensive file exclusions, keep only k8s templates
- Increase line length limit to 400 chars (GitHub Actions friendly)
- Allow flexible colon spacing (max-spaces-after: -1)
- Disable document-start requirement

This provides linting value while handling infrastructure patterns.

Signed-off-by: vanzan01 <vanzan.1250@gmail.com>

* Update .pre-commit-config.yaml

Co-authored-by: John Bampton <jbampton@users.noreply.github.com>

---------

Signed-off-by: vanzan01 <vanzan.1250@gmail.com>
Co-authored-by: John Bampton <jbampton@users.noreply.github.com>

.asf.yaml

@@ -63,7 +63,7 @@ github:
   protected_branches: ~
 
 notifications:
-  commits:      commits@cloudstack.apache.org
-  issues:       commits@cloudstack.apache.org
+  commits: commits@cloudstack.apache.org
+  issues: commits@cloudstack.apache.org
   pullrequests: commits@cloudstack.apache.org
-  discussions:  users@cloudstack.apache.org
+  discussions: users@cloudstack.apache.org

.github/linters/.yamllint.yml

@@ -0,0 +1,31 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+---
+extends: relaxed
+
+rules:
+  line-length:
+    max: 400  # Very forgiving for GitHub Actions and infrastructure files
+  indentation: disable  # Disable indentation checking for existing files
+  comments: disable  # Disable comment formatting checks
+  brackets: disable  # Disable bracket spacing checks
+  colons:
+    max-spaces-after: -1  # Allow any number of spaces after colon
+    max-spaces-before: 0
+  document-start: disable  # Many files don't have ---
+  truthy:
+    allowed-values: ['true', 'false', 'on', 'off', 'yes', 'no']

.pre-commit-config.yaml

@@ -94,3 +94,13 @@ repos:
         args: [--config=.github/linters/.markdown-lint.yml]
         types: [markdown]
         files: \.(md|mdown|markdown)$
+  - repo: https://github.com/adrienverge/yamllint
+    rev: v1.37.1
+    hooks:
+      - id: yamllint
+        name: run yamllint
+        description: check YAML files with yamllint
+        args: [--config-file=.github/linters/.yamllint.yml]
+        types: [yaml]
+        files: \.ya?ml$
+        exclude: ^.*k8s-.*\.ya?ml$