mimic3 running in a container is not accessible to speech-dispatcher

[flaurafauna]

Describe the bug
Using speech-dispatcher with mimic3 running in a container does not work as there is no functional /path/to/mimic3 to reference in mimic3-generic.conf. Speechd registers the existence of the mimic3 module, but attempting to use it yields no output. Mimic3 server is confirmed running at http://localhost:59125/ and functions as expected with the installed voices.

I am running mimic3 as a systemd service using a podman container with the same parameters as outlined here.

Steps to Reproduce

1. Place the following in $HOME/.config/containers/systemd/mimic3.container

[Unit]
Description=Podman Mimic3.service
Wants=network-online.target
After=network-online.target

[Service]
Restart=on-failure
TimeoutStartSec=900

[Container]
Image=docker.io/mycroftai/mimic3:latest
AutoUpdate=registry
PublishPort=59125:59125
Volume=%h/.local/share/mycroft/mimic3:/home/mimic3/.local/share/mycroft/mimic3:Z

[Install]
WantedBy=default.target

2. Run the container as a service using systemctl --user start mimic3
3. Add the following to /etc/speech-dispatcher/speechd.conf:

DefaultVoiceType  "FEMALE1"
DefaultLanguage "en"
AddModule "mimic3-generic" "sd_generic"  "mimic3-generic.conf"
DefaultModule mimic3-generic

4. copy the example /etc/speech-dispatcher/modules/mimic3-generic.conf from github.
5. Observe that the mimic3 server is running at localhost:59125 and that voice output works as expected
6. Observe that spd-say -O and spd-say -o mimic3-generic -L output mimic3-generic and a list of configured voices, respectively.
7. Attempt to say something using spd-say using any of the installed voices; observe that nothing happens.

Expected behavior
speech-dispatcher is able to use mimic3 voices to output text to speech audio.

Log files
/var/log/mycroft does not exist.

Environment (please complete the following information):

• Device type: Laptop
• OS: Fedora Silverblue
• Mycroft-core version: N/A
• Other versions: N/A

Additional context
Using the exact configuration above but installing mimic3 using pip rather than running as a container works as expected, but I would prefer to be able to run it as a container. Maybe I am just missing something obvious, but I have been troubleshooting this for a few days to no avail.