feat: add Docker deployment for the bot

- Add Dockerfile for Python 3.13 container
- Update docker-compose with naliia_bot service
- Add DB_HOST config for container networking
- Add .dockerignore for build optimization
- Update README with Docker documentation

src/naliiabotapi/api/dependencies.py

@@ -6,8 +6,9 @@ from .settings import _settings as st
 
 
 _protocol = "postgresql://"
-_connection_string =\
-    f"{_protocol}{st.DB_USER}:{st.DB_PASSWORD}@localhost:5432/{st.DB_NAME}"
+_connection_string = (
+    f"{_protocol}{st.DB_USER}:{st.DB_PASSWORD}@{st.DB_HOST}:5432/{st.DB_NAME}"
+)
 agent_instance: Agent | None = None
 db_pool = None
 
@@ -26,8 +27,5 @@ def get_async_connection_pool():
         conninfo=_connection_string,
         max_size=20,
         open=False,
-        kwargs={
-            "autocommit": True,
-            "prepare_threshold": 0,
-            "row_factory": dict_row
-        })
+        kwargs={"autocommit": True, "prepare_threshold": 0, "row_factory": dict_row},
+    )

src/naliiabotapi/api/settings.py

@@ -6,6 +6,7 @@ class Settings:
     DB_NAME = os.getenv("POSTGRES_DB", "messages")
     DB_USER = os.getenv("POSTGRES_USER", "postgres")
     DB_PASSWORD = os.getenv("POSTGRES_PASSWORD", "postgres")
+    DB_HOST = os.getenv("POSTGRES_HOST", "localhost")
 
     def __init__(self):
         load_dotenv()