ci: add root endpoint

server.py

@@ -1,8 +1,19 @@
 import fastapi, uvicorn
+from fastapi.responses import JSONResponse
 import os
 
 api = fastapi.FastAPI()
 
+
+@api.get("/")
+async def root():
+    """Get a welcome messge from the API."""
+    return JSONResponse(
+        content={"message": "Welcome to transactions email generator API."},
+        status_code=200,
+    )
+
+
 ...
 
 if __name__ == "__main__":