Update go2rtc, simplify manual stream, and support audio for MSE & WebRTC (#4391)

* Update go2rtc to rc3

* Simplify ffmpeg / audio conversions

* Set ffmpeg bin location

* Manually set video as copied

* Run go2rtc with env vars

* Remove manual ffmpeg declaration

* Enable force_audio by default

* Fix test

docker/Dockerfile

@@ -119,7 +119,7 @@ RUN --mount=type=bind,from=wheels,source=/wheels,target=/wheels \
 ENV PATH=$PATH:/usr/lib/btbn-ffmpeg/bin
 
 # install go2rtc
-RUN wget -O go2rtc "https://github.com/AlexxIT/go2rtc/releases/download/v0.1-rc.2/go2rtc_linux_${TARGETARCH}" \
+RUN wget -O go2rtc "https://github.com/AlexxIT/go2rtc/releases/download/v0.1-rc.3/go2rtc_linux_${TARGETARCH}" \
     && chmod +x go2rtc \
     && mkdir -p /usr/local/go2rtc/sbin/ \
     && mv go2rtc /usr/local/go2rtc/sbin/go2rtc

docker/rootfs/etc/services.d/go2rtc/run

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/with-contenv bash
 
 # https://gist.github.com/mohanpedala/1e2ff5661761d3abd0385e8223e16425?permalink_comment_id=3945021
 set -euo pipefail