CI: Add jobcount variable for testing hangs in CI #93

Job	Run time
coverity-test	0s
scanbuild	6m 56s
test-coverage	1h 19m 53s
build-test (ubuntu-20.04, gcc)	1h 19m 55s
test-fuzz	3m 3s
build-test (ubuntu-20.04, clang)	10m 23s
test-mbedtls (ubuntu-20.04)	1h 19m 55s
build-test (fedora-32, gcc)	10m 27s
test-no-crypto-build	1m 22s
build-test (fedora-32, clang)	10m 53s
test-mbedtls (ubuntu-22.04-mbedtls-3.1)	1h 19m 54s
build-test (opensuse-leap, gcc)	10m 31s
test-tcti-config	17m 17s
build-test (opensuse-leap, clang)	10m 32s
build-test (ubuntu-22.04, gcc)	1h 19m 55s
build-test (ubuntu-22.04, clang)	16m 49s
build-test (alpine-3.15, gcc)	9m 43s
build-test (alpine-3.15, clang)	10m 51s
	8h 38m 19s

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