How to install and configure a Docker container app as a site in ISPConfig

Hi. Thank you for your excellent work.
Running: ISPConfig 3.3
I have a few websites running in/under an ISPConfig installation.
I would like to add a website to my ISPConfig instance that will be an open source webapp. The webapp is provided as a Docker image/container (apologies—I am uncertain of the correct terminology at the moment). The app is Plane.
Naturally, I'll need HTTPS.

Here are a couple of links in case helpful:
https://plane.so
https://developers.plane.so/self-hosting/methods/docker-compose#install-community-edition

How might I go about making this work? I tried looking at some posts here that seem to be related to the topic, but they go over my head and I'm not even certain if they address what I'm looking for or not. I also attempted doing it on my own on a test server, but didn't really know what I was doing—it didn't work.

Thank you.

 

Very grateful for the overview! Thank you. And thank you for mentioning a possible port number to use.

Your Step 1):
Would you have suggestions on the values I might assign to these environmental variables I am supposed to define for the webapp? (This is a snippet from the Plane documentation. )

• LISTEN_HTTP_PORT: This is set to 80 by default. Make sure the port you choose to use is not preoccupied. For example, LISTEN_HTTP_PORT=8080
• LISTEN_HTTPS_PORT: This is set to 443 by default. Make sure the port you choose to use is not preoccupied. For example, LISTEN_HTTPS_PORT=4430
• WEB_URL: This is set to http://localhost by default. Change this to the FQDN you plan to use along with LISTEN_HTTP_PORT. For example, https://plane.example.com:8080 or http://[IP-ADDRESS]:8080.
• CORS_ALLOWED_ORIGINS: This is set to http://localhost by default. Change this to the FQDN you plan to use along with LISTEN_HTTP_PORT. For example, https://plane.example.com:8080 or http://[IP-ADDRESS]:8080.

I know you suggested as a possible port something like 8082, but if that gets assigned to LISTEN_HTTP_PORT, then what do I do with LISTEN_HTTPS_PORT? Likewise, should the WEB_URL be my real domain name that I have set up in ISPConfig for this site? Or? Apologies, these details aren't something I am familiar with.

Your Step 2):
I think I'm good on following that step.

Your Step 3):
(I use Apache.) May I request details on this part please? I figure this Step needs to work in harmony with the settings in Step 1, but the subject of proxies, etc aren't something I have a strong understanding of.

Again, thank you.