Detach test containers from STDIN #73

Job	Run time
Set up build environment	1s
Create self-hosted Actions runners (avahi) / Create runner	31s
Create self-hosted Actions runners (certbot-cloudflare) / Create runner	32s
Create self-hosted Actions runners (fullbogons) / Create runner	2h 0m 47s
Create self-hosted Actions runners (actions-runner) / Create runner	29s
Create self-hosted Actions runners (growatt-ev) / Create runner	26s
Create self-hosted Actions runners (iperf2) / Create runner	25s
Create self-hosted Actions runners (iperf3) / Create runner	25s
Create self-hosted Actions runners (irrd) / Create runner	16s
Create self-hosted Actions runners (mdns-reflector) / Create runner	18s
Create self-hosted Actions runners (rng-tools) / Create runner	15s
Create self-hosted Actions runners (speedtest) / Create runner	25s
Create self-hosted Actions runners (stun) / Create runner	24s
Create self-hosted Actions runners (telegraf) / Create runner	24s
Create self-hosted Actions runners (verlihub) / Create runner	36s
Create self-hosted Actions runners (vyos-release-alert) / Create runner	36s
Create self-hosted Actions runners (xteve) / Create runner	35s
Create self-hosted Actions runners (yancobat) / Create runner	16s
Build and test image without `--init`	0s
Build and test image	0s
	2h 7m 41s

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