CI: Add jobcount variable for testing hangs in CI #95

Job	Run time
scanbuild	12m 13s
test-coverage	1h 54m 53s
coverity-test	0s
build-test (ubuntu-20.04, gcc)	2m 30s
test-fuzz	4m 46s
test-mbedtls (ubuntu-20.04)	1h 54m 53s
build-test (ubuntu-20.04, clang)	2m 28s
test-no-crypto-build	1m 55s
test-mbedtls (ubuntu-22.04-mbedtls-3.1)	1h 54m 52s
build-test (fedora-32, gcc)	2m 30s
test-tcti-config	31m 16s
build-test (fedora-32, clang)	2m 35s
build-test (opensuse-leap, gcc)	2m 30s
build-test (opensuse-leap, clang)	2m 12s
build-test (ubuntu-22.04, gcc)	2m 27s
build-test (ubuntu-22.04, clang)	2m 28s
build-test (alpine-3.15, gcc)	2m 29s
build-test (alpine-3.15, clang)	2m 28s
	6h 59m 25s

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