chore: Run nightly builds on Node 14 (#1717)

* chore: Run nightly builds on Node 14

- Node 12 reached EoL in April 2022.
- `firebase-tools` has dropped support for Node 12 this breaks our nightly workflows.
- Updating the nightly workflow to run on Node 14 (we will also deprecate and drop support for Node 12 in Admin SDK in the upcoming releases).

* Run emulator tests only on Node 14

Author: lahirumaramba

.github/workflows/ci.yml

@@ -27,6 +27,7 @@ jobs:
     - name: Run api-extractor
       run: npm run api-extractor
     - name: Run emulator-based integration tests
+      if: matrix.node-version == '14.x'
       run: |
         npm install -g firebase-tools
         firebase emulators:exec --project fake-project-id --only auth,database,firestore \

.github/workflows/nightly.yml

@@ -36,7 +36,7 @@ jobs:
     - name: Set up Node.js
       uses: actions/setup-node@v1
       with:
-        node-version: 12.x
+        node-version: 14.x
 
     - name: Install and build
       run: |