Add documentation to the dev.okteto.com/inject-token annotation

[mnevadom]

Adding the annotation

dev.okteto.com/inject-token: "true"

to the okteto manifest will the the webhook to add the env OKTETO_TOKEN with the uid to de dev container.

Maybe we should find a place to document this

[rberrelleza]

@mnevadom this is great. What is the main use case for adding that injection? Is this something that we expect people to do a lot? (or maybe we already have people using it this way?)

[mnevadom]

In my case when I was doing okteto up in staging.

I needed to build images from inside the container, and for that I had to use the staging buildkit.

Therefore I needed to run okteto context use with the token I used, because I need any user to be able to run it without having an ENV token in staging (cindylopez for example).

I don't know if it is a very common to use it this way :)