feat: add meetee and tiennm hosting sites under miti99 project

Configure Firebase multi-site hosting so the redirect deploys to
meetee.web.app and tiennm.web.app alongside miti99.web.app, all
sharing the same public/ content under the miti99 project.

.github/workflows/firebase-hosting-miti99.yml

@@ -6,6 +6,9 @@ on:
 jobs:
   build_and_deploy:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        target: [miti99, meetee, tiennm]
     steps:
       - uses: actions/checkout@v4
       - uses: FirebaseExtended/action-hosting-deploy@v0
@@ -14,3 +17,4 @@ jobs:
           firebaseServiceAccount: ${{ secrets.FIREBASE_SERVICE_ACCOUNT_MITI99 }}
           channelId: live
           projectId: miti99
+          target: ${{ matrix.target }}

.github/workflows/firebase-hosting-tiennm99.yml

@@ -14,3 +14,4 @@ jobs:
           firebaseServiceAccount: ${{ secrets.FIREBASE_SERVICE_ACCOUNT_TIENNM99 }}
           channelId: live
           projectId: tiennm99
+          target: tiennm99