* Add a docker file to avoid rebuilding the same image on every run.
* Move all files involved into the linux_dist_support folder.
* Exclude more directories in the tarball.
* Delete version checker from test_matrix.
* Disable goma when running build.py.
Change-Id: Ic7b0a2359027d532c009cdf3187d873323170f30
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/195901
Reviewed-by: William Hesse <whesse@google.com>
Ryan Macnak