Add tests workflow

.gitea/workflows/test.yaml

@@ -0,0 +1,23 @@
+---
+name: "Test"
+
+# yamllint disable-line rule:truthy
+on:
+  pull_request:
+  push:
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v18
+      - uses: cachix/cachix-action@v12
+        with:
+          name: ytdl-web
+          extraPullNames: devenv
+          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+      - name: Install devenv.sh
+        run: nix profile install github:cachix/devenv/latest
+      - run: devenv shell echo ok
+      - run: devenv ci