Make /etc/supervisor a writable volume

Dockerfile

@@ -73,7 +73,7 @@ ONBUILD COPY ${BUILD_CONTEXT}/supervisor/ ${TFW_SUPERVISORD_COMPONENTS}
 ONBUILD RUN for f in "${TFW_NGINX_DEFAULT}" ${TFW_NGINX_COMPONENTS}/*.conf; do                               \
                 envsubst "$(printenv | cut -d= -f1 | grep TFW_ | sed -e 's/^/$/g')" < $f > $f~ && mv $f~ $f ;\
             done
-ONBUILD VOLUME ["/etc/nginx", "/var/lib/nginx", "/var/log/nginx", "${TFW_LIB_DIR}/tfw"]
+ONBUILD VOLUME ["/etc/nginx", "/etc/supervisor", "/var/lib/nginx", "/var/log/nginx", "${TFW_LIB_DIR}/tfw"]
 
 ENTRYPOINT ["/bin/init", "--"]
 CMD exec supervisord --nodaemon --configuration ${TFW_SUPERVISORD_CONF}

tfw/logging.py

@@ -2,6 +2,7 @@
 from datetime import datetime
 from typing import TextIO, Union
 from dataclasses import dataclass
+from collections.abc import Mapping
 from traceback import format_exception
 from logging import DEBUG, getLogger, Handler, Formatter, Filter
 
@@ -81,7 +82,7 @@ class LogFormatter(Formatter):
     def format(self, record):
         time = datetime.utcfromtimestamp(record.created).strftime('%H:%M:%S')
         if record.args:
-            tuple_args = (record.args,) if isinstance(record.args, dict) else record.args
+            tuple_args = (record.args,) if isinstance(record.args, Mapping) else record.args
             clean_args = tuple((self.trim(arg) for arg in tuple_args))
             message = record.msg % clean_args
         else: