.github: allow specifying HLS for webrtc load test playback (right lo… #725

Job	Run time
Build binaries for linux-arm64	1m 51s
Build binaries for linux-amd64	48s
Build binaries for windows-arm64	2m 5s
Build binaries for windows-amd64	2m 18s
Build binaries for darwin-arm64	4m 51s
Build binaries for darwin-amd64	2m 38s
Upload lapi to google bucket	37s
Upload loadtester to google bucket	27s
Upload mapi to google bucket	57s
Upload recordtester to google bucket	28s
Upload streamtester to google bucket	59s
Upload testdriver to google bucket	53s
	18m 52s

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