https://docs.python.org/3/library/shlex.html#shlex.quote ?

This pull request can no longer be automatically merged: a rebase is needed and changes have to be manually resolved

This PR has introduced a regression, custom containers (type='container') can not be deployed anymore.
Example of a custom service spec:

service_type: container
service_id: prometheus-webhook-snmp
placement:
  hosts:
    - master
image: registry.suse.com/ses/7/prometheus-webhook-snmp:latest
args:
    - "--publish 9099:9099"
envs:
    - ARGS="--debug --snmp-host=192.168.121.1"
    - RUN_ARGS="--metrics"

The shlex.quote is doing too much. E.g. the additional podman command line arg --publish 9099:9099 will be converted to "--publish 9099:9099" which leads to an podman error Error: unknown flag: --publish 9099:9099. Additionally environment variables will look like -e 'ARGS="--debug --snmp-host=192.168.121.1"' -e 'RUN_ARGS="--metrics"' in the resulting unit.run file.

It was possible to deploy whatever Docker container before this PR, e.g.

service_type: container
service_id: aria2-with-webui
placement:
    host_pattern: mgr0
image: abcminiuser/docker-aria2-with-webui:latest-ng
args:
    - "-p 6800:6800"
    - "-p 6880:80"
envs:
    - PGID=65534
    - PUID=65534
dirs:
    - DATA_DIR
volume_mounts:
    DATA_DIR: /data