Before return site domain & path, create the site

src/enable-pages.js

@@ -0,0 +1,31 @@
+const core = require('@actions/core')
+const axios = require('axios')
+
+async function enablePages({ repositoryNwo, githubToken }) {
+  const pagesEndpoint = `https://api.github.com/repos/${repositoryNwo}/pages`
+
+  try {
+    const response = await axios.post(
+      pagesEndpoint,
+      {
+        headers: {
+          Accept: 'application/vnd.github.v3+json',
+          Authorization: `Bearer ${githubToken}`,
+          'Content-type': 'application/json',
+        },
+        body: JSON.stringify({ build_type: 'workflow' }),
+      }
+    )
+    core.info('Created pages site')
+  } catch (error) {
+    if (error.response && error.response.status === 409) {
+      core.info('Pages site exists')
+      return
+    }
+
+    core.error('Couldn\'t create pages site', error)
+    throw error
+  }
+}
+
+module.exports = enablePages