Start work on GAP 4.15 #5874

Job	Run time
Cross compiler for s390x	27m 20s
Test in OpenBSD	7m 35s
testinstall - - ubuntu-latest	4m 49s
teststandard - - ubuntu-latest	19m 43s
testmanuals - - ubuntu-latest	5m 51s
testexpect testmockpkg testspecial test-compile testlibgap testkernel testworkspace - - ubuntu-latest	7m 13s
testpackages testinstall-loadall - - ubuntu-latest	26m 15s
makemanuals testmakeinstall - CONFIGFLAGS="--prefix=/tmp/gapprefix" NO_COVERAGE=1 - ubuntu-latest	5m 15s
teststandard - ABI=32 CONFIGFLAGS="" - ubuntu-20.04	18m 22s
testinstall - HPCGAP=yes ABI=64 - ubuntu-latest	7m 58s
testmockpkg testinstall - BOOTSTRAP_MINIMAL=yes - macos-latest	4m 11s
testbugfix - CONFIGFLAGS="--enable-memory-checking" - ubuntu-latest	28m 40s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=64 BUILDDIR=out-of-tree CONFIGFLAGS="--enable-valgrind" - ubuntu-latest	4m 49s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=32 BUILDDIR=out-of-tree CONFIGFLAGS="" - ubuntu-20.04	4m 31s
testinstall - JULIA=yes CONFIGFLAGS="--enable-debug" - ubuntu-20.04	4m 44s
testmockpkg testinstall - - windows-2019	16m 0s
Send Slack notification on status change	2s
	3h 13m 18s

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