ci: add stale theme pull request closer action push (#2067)

This commit adds the `stale-theme-pr-closer` closer action. This action
is used to close theme pull requests with an `invalid` label that has
been stale for a given number of `STALE_DAYS`.

scripts/helpers.js

@@ -0,0 +1,40 @@
+/**
+ * @file Contains helper functions used in the scripts.
+ */
+
+// Script variables.
+const OWNER = "anuraghazra";
+const REPO = "github-readme-stats";
+
+/**
+ * Retrieve information about the repository that ran the action.
+ *
+ * @param {Object} context Action context.
+ * @returns {Object} Repository information.
+ */
+export const getRepoInfo = (ctx) => {
+  try {
+    return {
+      owner: ctx.repo.owner,
+      repo: ctx.repo.repo,
+    };
+  } catch (error) {
+    return {
+      owner: OWNER,
+      repo: REPO,
+    };
+  }
+};
+
+/**
+ * Retrieve github token and throw error if it is not found.
+ *
+ * @returns {string} Github token.
+ */
+export const getGithubToken = () => {
+  const token = core.getInput("github_token") || process.env.GITHUB_TOKEN;
+  if (!token) {
+    throw Error("Could not find github token");
+  }
+  return token;
+};