feat(app): toggle service readiness checks via environment.

Closes #219

.env.example

@@ -1,5 +1,7 @@
 # App
 BUILD_NUMBER=
+CHECK_DB_READY=true
+CHECK_REDIS_READY=true
 DEBUG=true
 ENVIRONMENT=local
 NAME=my-starlite-app

src/starlite_saqlalchemy/lifespan.py

@@ -6,7 +6,7 @@
 import starlite
 from sqlalchemy import text
 
-from starlite_saqlalchemy import redis
+from starlite_saqlalchemy import redis, settings
 from starlite_saqlalchemy.db import engine
 
 logger = logging.getLogger(__name__)
@@ -41,5 +41,7 @@ async def _redis_ready() -> None:
 
 async def before_startup_handler(_: starlite.Starlite) -> None:
     """Do things before the app starts up."""
-    await _db_ready()
-    await _redis_ready()
+    if settings.app.CHECK_DB_READY:
+        await _db_ready()
+    if settings.app.CHECK_REDIS_READY:
+        await _redis_ready()

src/starlite_saqlalchemy/settings.py

@@ -27,6 +27,10 @@ class Config:
 
     BUILD_NUMBER: str = ""
     """Identifier for CI build."""
+    CHECK_DB_READY: bool = True
+    """Check for database readiness on startup."""
+    CHECK_REDIS_READY: bool = True
+    """Check for redis readiness on startup."""
     DEBUG: bool = False
     """Run `Starlite` with `debug=True`."""
     ENVIRONMENT: str = "prod"