ci: fix container builds for PRs and sets proper PX4 git tags #27528

Job	Run time
build (check_format)	1m 5s
build (check_newlines)	1m 27s
build (tests)	5m 33s
build (tests_coverage)	7m 9s
build (px4_fmu-v2_default stack_check)	3m 6s
build (validate_module_configs)	54s
build (shellcheck_all)	1m 35s
build (NO_NINJA_BUILD=1 px4_fmu-v5_default)	4m 7s
build (NO_NINJA_BUILD=1 px4_sitl_default)	3m 18s
build (px4_sitl_allyes)	4m 13s
build (module_documentation)	55s
	33m 22s

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