fa26387769 ci: Refactor: Remove CI_USE_APT_INSTALL (MarcoFalke)
Pull request description:
Seems odd to use `CI_USE_APT_INSTALL == no` as an alias for `CI_OS_NAME == macos`. Fix this by removing the alias.
Also, for github CI:
* restore MAKEJOBS to the same value as in cirrus.yml.
* remove cirrus-only PACKAGE_MANAGER_INSTALL.
* remove redundant TEST_RUNNER_TIMEOUT_FACTOR
* Add M1 link
ACKs for top commit:
hebasto:
ACK fa26387769.
Tree-SHA512: e235aa70abd60738a9ad1531284a94e2122c9c7a22c2514ede437b49da5c06b2597fba7fccf615541fb3adb4e1f8076aa8c6047f926393191a629713554ab000