Commit 8e9a75f removed the COPY+RUN of patch_tts_tool.py
because the build context was thought to be insufficient.
The build context is ai/ which contains both the Dockerfile
and patch_tts_tool.py, so COPY works fine.
Without this step the tts_tool.py silently falls through
to Edge TTS as its default provider even when
config.yaml says provider: piper, because 'piper' is not
a recognized provider in the unpatched code. This caused
the female Edge TTS voice (AriaNeural) instead of the
configured Ryan High male voice.
0609720b33