Improve docker setup

- add .dockerignore
- add entrypoint.sh to switch to user after initial setup
- downgrade importlib-metadata for Celery compatibility
- add TZ environment variable for consistent Celery timestamps
- fix Celery setting deprecation warnings

gvaweb/webtasks/settings.py

@@ -8,7 +8,7 @@ Common settings and globals.
 from os import environ
 
 
-def get_env_setting(setting):
+def get_env_variable(setting):
     """
     Get the environment setting or return exception.
 
@@ -25,20 +25,20 @@ def get_env_setting(setting):
 
 
 ########## CELERY CONFIGURATION
-CELERY_TIMEZONE = "Europe/Berlin"
-CELERY_ENABLE_UTC = True
-CELERY_RESULT_PERSISTENT = True
-CELERY_TASK_RESULT_EXPIRES = None
-CELERY_ROUTES = ("gvacommon.celeryrouters.GvaRouter",)
-CELERY_ACCEPT_CONTENT = ["json"]
-CELERY_TASK_SERIALIZER = "json"
-CELERY_RESULT_SERIALIZER = "json"
-CELERY_RESULT_BACKEND = get_env_setting("GVAWEB_RESULTS_REDIS_URL")
-CELERY_BROKER_URL = get_env_setting("GVAWEB_BROKER_URL")
+accept_content = ["json"]
+broker_url = get_env_variable("GVAWEB_BROKER_URL")
+enable_utc = True
+result_backend = get_env_variable("GVAWEB_RESULTS_REDIS_URL")
+result_expires = None
+result_persistent = True
+result_serializer = "json"
+task_routes = ("gvacommon.celeryrouters.GvaRouter",)
+task_serializer = "json"
+timezone = "Europe/Berlin"
 ########## END CELERY CONFIGURATION
 
 ########## GVAWEB CONFIGURATION
-GVAWEB_NGINX_SITES_AVAILABLE = get_env_setting("GVAWEB_NGINX_SITES_AVAILABLE")
-GVAWEB_NGINX_SITES_ENABLED = get_env_setting("GVAWEB_NGINX_SITES_ENABLED")
-GVAWEB_WWWUSER_MOUNT = get_env_setting("GVAWEB_WWWUSER_MOUNT")
+GVAWEB_NGINX_SITES_AVAILABLE = get_env_variable("GVAWEB_NGINX_SITES_AVAILABLE")
+GVAWEB_NGINX_SITES_ENABLED = get_env_variable("GVAWEB_NGINX_SITES_ENABLED")
+GVAWEB_WWWUSER_MOUNT = get_env_variable("GVAWEB_WWWUSER_MOUNT")
 ########## END GVAWEB CONFIGURATION