Set truthy value in environment var

Author: medihack

docker-compose.base.yml

@@ -13,7 +13,7 @@ x-app: &default-app
     DJANGO_CSRF_TRUSTED_ORIGINS: ${DJANGO_CSRF_TRUSTED_ORIGINS:-}
     DJANGO_SECRET_KEY: ${DJANGO_SECRET_KEY:?}
     DJANGO_SERVER_EMAIL: ${DJANGO_SERVER_EMAIL:?}
-    IS_DOCKER_CONTAINER: true
+    IS_DOCKER_CONTAINER: 1
     PROJECT_VERSION: ${PROJECT_VERSION:-vX.Y.Z}
     SITE_DOMAIN: ${SITE_DOMAIN:?}
     SITE_NAME: ${SITE_NAME:?}