Create .gitpod.yml

[mickmister]

Summary

This PR makes it so when this repository is used to create a Gitpod workspace, the configuration used will be delegated to the mattermost-gitpod-config repo through its .gitpod.yml file.

This allows multiple repos to share the same Gitpod config, as well as keeping the commit history minimal in regards to the individual repos.

https://www.gitpod.io/docs/references/gitpod-yml
https://www.gitpod.io/docs/multi-repo-workspaces

Ticket Link

Fixes https://mattermost.atlassian.net/browse/MM-43928

[codecov-commenter]

Codecov Report

Merging #167 (79588bc) into master (fe2f45d) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #167   +/-   ##
======================================
  Coverage    8.42%   8.42%           
======================================
  Files          10      10           
  Lines        1152    1152           
======================================
  Hits           97      97           
  Misses       1047    1047           
  Partials        8       8           

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