iox-#2084 Fix qnx build and setup CI for gcc 8.3 #7763

Job	Run time
pre-flight-check	27s
build-test-ubuntu	17m 4s
build-test-macos-with-address-sanitizer	16m 27s
build-test-ubuntu-bazel	18m 34s
build-test-ubuntu-with-address-sanitizer-gcc-latest	11m 54s
build-test-ubuntu-with-address-sanitizer-clang-latest	9m 4s
build-test-ubuntu-with-thread-sanitizer-clang-latest	9m 24s
build-test-windows	11m 33s
coverage-and-docs	19m 53s
run-integration-test	13m 12s
	2h 7m 32s

Provide feedback