ci: add semantic release configuration

This will avoid the NPM publication.

Author: e0ipso

release.config.js

@@ -0,0 +1,6 @@
+module.exports = {
+  branches: ['master'],
+  analyzeCommits: 'semantic-release-conventional-commits',
+  repositoryUrl: 'https://github.com/js-widgets/example-widget.git',
+  plugins: ['@semantic-release/commit-analyzer', '@semantic-release/github'],
+};