build: add commitlint exception for Dependabot

Dependabot commit messages may not respect the 100-chars max length
rule. We need to have an exception for all Dependabot commits.

See dependabot/dependabot-core#2445

Signed-off-by: Simon Pasquier <spasquie@redhat.com>

commitlint.config.js

@@ -0,0 +1,12 @@
+const Configuration = {
+  /*
+   * Resolve and load @commitlint/config-conventional from node_modules.
+   */
+  extends: ['@commitlint/config-conventional'],
+  /*
+   * Ignore dependabot commit messages until https://github.com/dependabot/dependabot-core/issues/2445 is fixed.
+   */
+  ignores: [(msg) => /Signed-off-by: dependabot\[bot]/m.test(msg)],
+};
+
+module.exports = Configuration;