ci: add oe-selftest-gcc test job

gcc test suite has been integrated in oe-selftest framework. It allows to run gcc test against qemu vm and within the build env using qemu linux-user mode.

These tests can be run in gitlab CI with qemu friendly runners. This commit add three oe-selftest jobs to run the tests using qemu linux-user, qemu x86-64 vm and qemu arm64 vm.

Test log and sum files are collected as job artifacts.

When all test jobs finish, report job will be triggered to parse the sum files to generate results in the format that supported by squad. The report job will upload results to squad for reporting.

Closes issues #8 (closed) and #9 (closed).

Signed-off-by: Chase Qi chase.qi@linaro.org