Re-enable github actions (#655)

Summary:
This reverts commit 5bd0cd3d63 and adds back the github actions which were temporarily disabled.
Pull Request resolved: https://github.com/facebook/flipper/pull/655

Reviewed By: passy

Differential Revision: D18656754

Pulled By: jknoxville

fbshipit-source-id: 9dc9a9aa4224f996677ddfbaf37387ae0b066c56

.github/workflows/android.yml

@@ -0,0 +1,27 @@
+name: Publish Sample App
+
+on:
+  release:
+    types: [created]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: set up JDK 1.8
+      uses: actions/setup-java@v1
+      with:
+        java-version: 1.8
+    - name: Build with Gradle
+      run: ./gradlew sample:assembleDebug
+    - name: Rename apk
+      run: mv android/sample/build/outputs/apk/debug/sample-debug.apk SampleApp-android.apk
+    - name: Upload
+      uses: skx/github-action-publish-binaries@master
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      with:
+        args: 'SampleApp-android.apk'

.github/workflows/nodejs.yml

@@ -0,0 +1,27 @@
+name: Node CI
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [10.x, 12.x]
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+    - name: yarn install
+      run: yarn
+    - name: lint
+      run: yarn lint
+    - name: test
+      run: yarn test
+    - name: build
+      run: yarn build --linux