Fix invalid url when being referenced by project id alias

Closes FirebaseExtended#213

Author: lopes-gustavo

src/getProjectIdByAlias.ts

@@ -0,0 +1,6 @@
+import { readFileSync } from "fs";
+
+export function getProjectIdByAlias(alias: string): string {
+    const firebaserc = JSON.parse(readFileSync(".firebaserc", { encoding: 'utf-8' }));
+    return firebaserc.projects[alias];
+}

src/index.ts

@@ -36,6 +36,7 @@ import {
   getURLsMarkdownFromChannelDeployResult,
   postChannelSuccessComment,
 } from "./postOrUpdateComment";
+import { getProjectIdByAlias } from "./getProjectIdByAlias";
 
 // Inputs defined in action.yml
 const expires = getInput("expires");
@@ -99,7 +100,8 @@ async function run() {
       }
       endGroup();
 
-      const hostname = target ? `${target}.web.app` : `${projectId}.web.app`;
+      const parsedProjectId = getProjectIdByAlias(projectId) || projectId;
+      const hostname = target ? `${target}.web.app` : `${parsedProjectId}.web.app`;
       const url = `https://${hostname}/`;
       await finish({
         details_url: url,