Fix/deno gitpod

[okikio]

Changes

Add deno to Gitpod. deno isn't installed by default in deno, so we need to install it ourselves, this change adds the script required to install deno in gitpod. I followed the instruction gitpod has on deno, https://www.gitpod.io/docs/languages/deno

Testing

Docs

It's a CI update that adds deno support which was missing, it doesn't need to be documented

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Latest commit: f4d6a53

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