Add missing GitHub snippet

Author: samtstern

auth-next/github.js

@@ -27,6 +27,14 @@ function githubProvider() {
   // [END auth_github_provider_params]
 }
 
+function githubProviderCredential(token) {
+  // [START auth_github_provider_credential]
+  const { GithubAuthProvider } = require("firebase/auth");
+
+  const credential = GithubAuthProvider.credential(token);
+  // [END auth_github_provider_credential]
+}
+
 function githubSignInPopup(provider) {
   // [START auth_github_signin_popup]
   const { getAuth, signInWithPopup, GithubAuthProvider } = require("firebase/auth");

auth/github.js

@@ -20,6 +20,12 @@ function githubProvider() {
   // [END auth_github_provider_params]
 }
 
+function githubProviderCredential(token) {
+  // [START auth_github_provider_credential]
+  var credential = firebase.auth.GithubAuthProvider.credential(token);
+  // [END auth_github_provider_credential]
+}
+
 function githubSignInPopup(provider) {
   // [START auth_github_signin_popup]
   firebase

snippets/auth-next/github/auth_github_provider_credential.js

@@ -0,0 +1,10 @@
+// This snippet file was generated by processing the source file:
+// ./auth-next/github.js
+//
+// To make edits to the snippets in this file, please edit the source
+
+// [START auth_github_provider_credential_modular]
+import { GithubAuthProvider } from "firebase/auth";
+
+const credential = GithubAuthProvider.credential(token);
+// [END auth_github_provider_credential_modular]