Use pip to install SIPssert in Docker image #11

Job	Run time
opensips / setup-matrix	6s
opensips / test (accounting, ubuntu-latest)	1m 37s
opensips / test (auth, ubuntu-latest)	2m 6s
opensips / test (b2b, ubuntu-latest)	7m 23s
opensips / test (dialog, ubuntu-latest)	2m 52s
opensips / test (permissions, ubuntu-latest)	1m 6s
opensips / test (presence, ubuntu-latest)	55s
opensips / test (record-route, ubuntu-latest)	57s
opensips / test (registration, ubuntu-latest)	4m 21s
opensips / test (startup, ubuntu-latest)	1m 22s
opensips / test (stir-shaken, ubuntu-latest)	5m 2s
opensips / test (topology-hiding, ubuntu-latest)	3m 0s
opensips / test (uac-auth, ubuntu-latest)	2m 55s
	33m 42s

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