Initial commit

This is a FastAPI backend microservice template used with `copier` utility.

Features of applied template are:
- Configuration file processing logic
- Metrics and tracing (both optional) configuration available
- Debug endpoints
- Database migration commands, prepared Alembic environment
- Database usage example in ping_db endpoint
- gitea sanity check pipeline

{{project_slug}}/observability/metrics_server.py

@@ -0,0 +1,22 @@
+"""Prometheus server configuration class is defined here."""
+
+from threading import Thread
+from wsgiref.simple_server import WSGIServer
+
+from prometheus_client import start_http_server
+
+
+class PrometheusServer:  # pylint: disable=too-few-public-methods
+
+    def __init__(self, port: int = 9464, host: str = "0.0.0.0"):
+        self._host = host
+        self._port = port
+        self._server: WSGIServer
+        self._thread: Thread
+
+        self._server, self._thread = start_http_server(self._port)
+
+    def shutdown(self):
+        if self._server is not None:
+            self._server.shutdown()
+            self._server = None