add github action

Author: ushi-as

.github/workflows/main.yml

@@ -0,0 +1,21 @@
+on: push
+
+jobs:
+  crx:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          path: trektor
+      - uses: actions/setup-node@v2
+        with:
+          cache: yarn
+          cache-dependency-path: trektor/yarn.lock
+      - run: yarn install
+        working-directory: trektor
+      - uses: browser-actions/setup-chrome@latest
+      - run: |
+          export DISPLAY=:99
+          sudo Xvfb -ac :99 -screen 0 1280x1024x24 > /dev/null 2>&1 &
+          chrome --pack-extension=trektor
+      - run: ls -l