Quadlet: Handle multiple Exec= entries

[wnhrt]

Feature request description

Allowing multiple Exec= entries, like with Label=, would provide better readability and maintainability.

A prime example is the example docker-compose.yml of treafik with four long entries.
My own configuration is 18 arguments long and at exactly 1000 characters not easily manageable in a single line.

Suggest potential solution

Allowing multiple Exec= entries, like with Label=.

Have you considered any alternatives?

No. I am in the progress of migrating from docker compose and have not much experience with quadlets.
If there is an alternative approach, which I overlooked, please let me know.

Additional context

Related issue: #22027

I was able to start a container with multiple Exec= entries but podman ps shows only the arguments from the last entry.
This case, silently ignoring present configuration, seems more problematic than failing with an error.

[Container]
Image=docker.io/library/traefik
Exec="--api.insecure=true"
Exec="--providers.docker=true"
Exec="--providers.docker.exposedbydefault=false"
Exec="--entryPoints.web.address=:80"
Notify=true
Volume=%t/podman/podman.sock:/var/run/docker.sock
SecurityLabelDisable=true

CONTAINER ID  IMAGE                             COMMAND               CREATED        STATUS        PORTS       NAMES
1ab2d3e4f5g6  docker.io/library/traefik:latest  --entryPoints.web...  7 minutes ago  Up 7 minutes  80/tcp      systemd-traefik