Add test devbox Github Action

Author: prestoncabe

.github/workflows/test-devbox.yml

@@ -0,0 +1,21 @@
+name: Testing with devbox
+
+on:
+  push:
+    branches:
+      - 157-offline-dev
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install devbox
+        uses: jetify-com/[email protected]
+
+      - name: Run a script called test
+        run: devbox run setup
+
+      - name: Run arbitrary commands
+        run: devbox run -- echo "done!"