add yaml for gitea actions

.gitea/workflows/test.yaml

@@ -0,0 +1,15 @@
+name: Z-py Gitea Actions
+run-name: ${{ gitea.actor }} for z-py 
+on: [push]
+
+jobs:
+  setup-environment:
+    runs-on: native
+    steps:
+      - run: nix-shell
+      - run: pip install -r requirements.txt
+      - run: pip install .
+  run-tests:
+    runs-on: native
+    steps:
+      - run: pytest