ci: allow longer commit messages in commitlint (#346)

.github/semantic.yml

@@ -0,0 +1,2 @@
+# Always validate the PR title, and ignore the commits
+titleOnly: true

commitlint.config.js

@@ -0,0 +1,6 @@
+module.exports = {
+  extends: ['@commitlint/config-conventional'],
+  rules: {
+    'body-max-line-length': [0, 'always', Infinity], // disable commit body length restriction
+  },
+}