Set Heisenbridge media URL

[Firefishy]

Describe the bug
Heisenbridge by default uses the matrix_heisenbridge_homeserver_url as the media url which is set to matrix_homeserver_container_url (matrix-nginx-proxy:12080). The ansible code should set a correct media URL, as heisenbridge now supports setting a separate media url.

To Reproduce

• Install Heisenbridge
• Attach an image in an IRC channel supported by Heisenbridge
• Heisenbridge sends a media URL to IRC: https://matrix-nginx-proxy:12080/...

Expected behavior
Expectation the url is the external https://matrix.example.com/...

[Firefishy]

A workaround for the moment is to override the MEDIAURL within matrix by sending private messaging to the heisenbridge bot with a command: mediaurl https://matrix.example.com/.

Ideally heisenbridge should be supplied with the correct mediaurl out-the-box by ansible.

[signaleleven]

If you mean the domain used when you post media in a bridged chat

matrix_heisenbridge_homeserver_url: "example.tld"

does what you need

[spantaleev]

For my setup, I didn't find this to be necessary, because it was auto-detecting the media URL by itself:

matrix-heisenbridge[1127966]: Trying to detect homeserver public endpoint, this might take a while...
matrix-heisenbridge[1127966]: Homeserver is publicly available at https://matrix.DOMAIN

Nevertheless, given that we know the value, there's no need for this guessing game.

The playbook now configures the media_url explicitly, using matrix_homeserver_url.

[Firefishy]

Rockstars! Thank you for being awesome. :-)