Auto build QGIS server Docker images

use fake 0 version if no docker has ever been built #771

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Run time

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Job	Run time
build nightly (desktop)	5m 16s
build (desktop, focal, stable)	6s
build nightly (server)	4m 51s
build (desktop, focal, ltr)	8s
build (desktop, jammy, stable)	11s
build (desktop, jammy, ltr)	7s
build (desktop, lunar, stable)	14m 59s
build (desktop, lunar, ltr)	16m 39s
build (server, focal, stable)	10s
build (server, focal, ltr)	10s
build (server, jammy, stable)	8s
build (server, jammy, ltr)	10s
build (server, lunar, stable)	14m 35s
build (server, lunar, ltr)	13m 31s
	1h 11m 1s