Add support for Container Optimized OS
What critical bug this MR is fixing?
Adds support for Container Optimized OS which we've chosen as our replacement for CoreOS (which reached EOL in May and in September was removed from GCP)
How does this change help reduce cost of usage? What scale of cost reduction is it?
In what scenarios is this change usable with GitLab Runner's docker+machine executor?
Closes #14 (closed)
Edited by Tomasz Maczukin