Support Devfile

[Edward13ruf]

Is your feature request related to a problem? Please describe

GitLab recently released their workspaces feature into beta and with it we can now see they are utilising Devfiles, which are an open specification for workspace definitions, much like .gitpod.yml. In an effort to support more projects using an opensource standard, we should also support devfiles as an alternative when the .gitpod.yml file is not present.

Describe the behaviour you'd like

When the .gitpod.yml file is not present in a project the devfile is used instead, and all the config needed to run the project is loaded in and run like normal.

Additional context

Supporting additional formats will help to enable more projects from across the open source communities to work with their choice of remote IDE's without having to support numerous bespoke config files.

[github-actions[bot]]

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