prevent exception if allgo.log contains invalid UTF-8 chars

1 job for django in 45 seconds
Name Stage Failure
failed
bootstrap Build
Step 7/7 : EXPOSE	25  143
---> Using cache
---> 5d588c67fef0
Successfully built 5d588c67fef0
Successfully tagged allgo_dev-smtpsink:latest
+ mkdir -p -- data/mysql
+ docker-compose run --rm dev-mysql sh -e -c 'if [ -f /dk/container_init ] ; then sleep 1; /dk/container_init ; fi'
error: db is already initialised
ERROR: Job failed: exit code 1