Application ingress settings
Enable ingress for applications that need an HTTP or TCP endpoint.
Ingress

Ingress traffic

Ingress type

Target port
Enter port
Exposed port
Enter port
What to choose here

And also do I need to add any environment variable like CUSTOM_PORT or anything or no need to add it. And After deploying azure container apps how to connect tell all details

I created and pushed this docker image - 
container-xrdp
Docker container for xrdp⁠ (both Xorg⁠ and Xvnc⁠) currently based on Fedora⁠, and Ubuntu⁠. Full desktop environment Xfce⁠ is supported on both amd64 and arm64 hardware. No privilege or sys_cap is required on the host system. These containers are lightweight and ideal for rapid development and testing purposes. Notice that the state of the container is not persisted between runs. In order to persist the state of the container, see this guide⁠.

How to use
First pull the container with the appropriate tag. the following tag combinations are available:

danchitnis/xrdp:ubuntu-xfce
danchitnis/xrdp:fedora-xfce
danchitnis/xrdp:amazon-mate (no longer supported)
danchitnis/xrdp:amazon-xfce (no longer supported)
danchitnis/xrdp:centos7-mate (no longer supported)
danchitnis/xrdp:centos7-xfce (no longer supported)
danchitnis/xrdp:centos8-xfce (no longer supported)
Example:

docker pull danchitnis/xrdp:ubuntu-xfce
You have to give username, password, and sudo ability as input arguments to the docker run command. Hence, each user has three parameters. The process will exit if the input arguments are incorrect. Please run as interactive mode at first instance.

Example when username is foo, password is bar and sudo ability is no:

docker run -it -p 33890:3389 danchitnis/xrdp:ubuntu-xfce foo bar no
Similarly for detached mode

docker run -d -p 33890:3389 danchitnis/xrdp:ubuntu-xfce foo bar no
Once running, open Remote Desktop Connection. Enter "localhost:33890" as the address.

In this example username is foo and the password is bar.

Nightly builds
Nightly builds are available for the following tags:

danchitnis/xrdp:ubuntu-xfce-next
danchitnis/xrdp:fedora-xfce-next
simply replace the tag with the nightly tag to pull and run the nightly build.

Example:

docker run -it -p 33890:3389 danchitnis/xrdp:ubuntu-xfce-next foo bar no
Please note that these nightly builds are built automatically and have not been tested. As a result, they may not work as expected. If the login fails, please try using the main tag.

Adding more users
You can add more users as a list of arguments and 3 inputs per user as described above

Example:

User Pass Sudo
foo bar yes
baz cox no
docker run -it -p 33890:3389 danchitnis/xrdp:ubuntu-xfce foo bar yes baz qux no
Sudo users
Adding a sudo user will give that user sudo ability so that you can run privileged command inside the container

For example start docker container with

docker run -d -p 33890:3389 danchitnis/xrdp:ubuntu-xfce foo bar yes
Once inside the container user foo can do this

sudo yum update
Notice that to give sudo ability, the third input parameter for each user should be explicitly yes, otherwise any other input will be ignored.

Build
Check the following guide⁠ for building your own containers.