Offline installation and searchable inputs

configs/docker_config.py

@@ -45,6 +45,7 @@ legal_envvars = (
     'SAML_LOGOUT',
     'SAML_LOGOUT_URL',
     'SAML_ASSERTION_ENCRYPTED',
+    'OFFLINE_MODE'
 )
 
 legal_envvars_int = ('PORT', 'MAIL_PORT', 'SAML_METADATA_CACHE_LIFETIME')
@@ -61,6 +62,7 @@ legal_envvars_bool = (
     'SAML_WANT_MESSAGE_SIGNED',
     'SAML_LOGOUT',
     'SAML_ASSERTION_ENCRYPTED',
+    'OFFLINE_MODE'
 )
 
 # import everything from environment variables