Docker shared filesystem

• Services and container now shares filesystem via docker volume #665
• Don't run manual jobs if past jobs failed #663
• Pull image if podman fails image inspect #657
• Adding docker.io to gitlab-ci-local-util image #654
• Support artifacts:when:always #652
• Add CI_JOB_NAME_SLUG to predefined variables #651

Thanks to @ticapix, @trygve55, @atli-c, @kouk, @alexander-matthiesen and @FnuGk for helping out 😄