feat: github-api-url (#88)

closes #77

---------

Co-authored-by: Parker Brown <17183625+parkerbxyz@users.noreply.github.com>

tests/main-custom-github-api-url.test.js

@@ -0,0 +1,13 @@
+import { test, DEFAULT_ENV } from "./main.js";
+
+// Verify that main works with a custom GitHub API URL passed as `github-api-url` input
+await test(
+  () => {
+    process.env.INPUT_OWNER = process.env.GITHUB_REPOSITORY_OWNER;
+    process.env.INPUT_REPOSITORIES = process.env.GITHUB_REPOSITORY;
+  },
+  {
+    ...DEFAULT_ENV,
+    "INPUT_GITHUB-API-URL": "https://github.acme-inc.com/api/v3",
+  }
+);