Updated GPR post publish script

Author: jeffreylanters

scripts/gpr-post-publish.js

@@ -1,8 +1,15 @@
+/**
+ * Since this package has been published already on NPM before the GPR was
+ * available, the package's json file will be altered before publishing to it.
+ */
 const fileSystem = require("fs");
 const pathUtility = require("path");
 const packageFilePath = pathUtility.join(__dirname, "../package.json");
 let packageJson = String(fileSystem.readFileSync(packageFilePath));
 const package = JSON.parse(packageJson);
 package.name = "@jeffreylanters/" + package.name;
+package.publishConfig = {
+  registry: "https://npm.pkg.github.com/jeffreylanters",
+};
 packageJson = JSON.stringify(package);
 fileSystem.writeFileSync(packageFilePath, packageJson);