Build tarball on pull requests

Signed-off-by: Julius Härtl <jus@bitgrid.net>

.github/workflows/appbuild.yml

@@ -0,0 +1,38 @@
+name: Build app package
+
+on:
+  pull_request:
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [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: Setup PHP
+      uses: shivammathur/setup-php@v1
+      with:
+        php-version: '7.4'
+        tools: composer
+    - name: install dependencies
+      run: |
+        wget https://github.com/ChristophWurst/krankerl/releases/download/v0.12.2/krankerl_0.12.2_amd64.deb
+        sudo dpkg -i krankerl_0.12.2_amd64.deb
+    - name: package
+      run: |
+        uname -a
+        RUST_BACKTRACE=1 krankerl --version
+        RUST_BACKTRACE=1 krankerl package
+    - uses: actions/upload-artifact@v2
+      with:
+        name: Deck app tarball
+        path: build/artifacts/deck.tar.gz