Changing the default container port from port 80 to another port

[rajcheval]

ISSUE

CM and CD images use container port 80. I need to use a port other than port 80

• I have tried with the latest version of Docker for Windows (Stable or Edge) or Docker Enterprise.
• [ x] Windows version is at least 1809 / ltsc2019.
• [ x] Windows has the latest updates installed.

Expected behavior

Actual behavior

port 80 is not available to me.

Additional information

I am trying to provision Sitecore 10.0.0 in AWS ECS.
I am using Windows Containers
I was able get Solr, MSSQL, Solr init containers to run successfully.
I am running into a problem while running CM and CD containers.
Problem is a limitation of ECS. I am enabling IAM roles for containers.
As a result of this port 80 is not available.
I can use any other port except port 80
Do I have build the images on my own to using a port other than port 80?
I will have to find the relevant Dockerfiles and change statement expose 80 to expose 81.
I will have to push these images into my own private Docker Registry.
Can someone confirm if this approach is correct of if there is another way to implement this.

• Output from docker info:

  ...
  

• Are you running inside a virtualized Windows machine or physical:
  AWS ECS Windows Container Cluster

Steps to reproduce the behavior

I was not sure how to ask this question so I created an issue. If there is another place where I could have asked this question let me know and I will do so in future.