[Chapel Merge] 1.27.0 Docker updates

Branch: refs/heads/main
Revision: 3ffc1ff
Author: tzinsky
Link: Unavailable
Log Message:

Merge pull request #20124 from tzinsky/1.27dockerupdates

1.27.0 Docker updates

Modified Files:
M util/dockerfiles/Dockerfile

M util/dockerfiles/README.md

Compare: https://github.com/chapel-lang/chapel/compare/ec90c854b4c6...3ffc1fff4a23