Set up pkg GitHub Action (#848)

Summary:
Setting up another action for `flipper-pkg`.
Pull Request resolved: https://github.com/facebook/flipper/pull/848

Reviewed By: nikoant

Differential Revision: D20191654

Pulled By: passy

fbshipit-source-id: 18e8fd7f697fe9a7f11c85d13b50322cbd218d12

.github/workflows/nodejs-pkg.yml

@@ -0,0 +1,26 @@
+name: PKG Node CI
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - uses: actions/setup-node@v1
+      with:
+        node-version: '12.x'
+    - name: install
+      working-directory: pkg
+      run: yarn
+    - name: lint
+      working-directory: pkg
+      run: yarn lint
+    - name: test
+      working-directory: pkg
+      run: yarn test
+    - name: run
+      working-directory: pkg
+      run: bin/run

.github/workflows/nodejs.yml

@@ -1,4 +1,4 @@
-name: Node CI
+name: Flipper Node CI
 
 on: [push, pull_request]