Configure Home Assistant in Developer Container to be able to talk to media devices

Development
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1

I download HA core. Open in Visual Studio and opened the development container.
I enabled the avahi-daemon reflector on the machine hosting the docker container.
It discovered my media devices. When I try to do a tts.speak action from the developer console I get the following error:

2025-02-28 23:36:42.478 ERROR (Thread-9) [homeassistant.components.cast.media_player] Failed to cast media http://172.17.0.2:8123/api/tts_proxy/2AslKXuy44epZ00q3Z_ZjA.mp3 from internal_url (http://172.17.0.2:8123). Please make sure the URL is: Reachable from the cast device and either a publicly resolvable hostname or an IP address
2025-02-28 23:38:36.247 ERROR (Thread-7) [homeassistant.components.cast.media_player] Failed to cast media http://172.17.0.2:8123/api/tts_proxy/2AslKXuy44epZ00q3Z_ZjA.mp3 from internal_url (http://172.17.0.2:8123). Please make sure the URL is: Reachable from the cast device and either a publicly resolvable hostname or an IP address

What changes do I need to make to my container to talk to media devices the HA has already discovered ?

2

I solved this myself.
In HA settings → system → network.
I changed the auto configured IP address 172.17.0.2 (which is a docker container network address) to the ip address of the machine hosting the container.