build: add yaml linter

[blacha]

Motivation

We are somewhat inconsitent in our yaml styles, some things are quoted where they shouldn't need to be quoted.

This is a first draft of applying a linter, I have tried to use the default rules where they don't conflict with prettier as we already use prettier for the yaml formatting.

Modifications

Installs eslint-plugin-yml yaml linter and adds it to eslint to be run on every pull request

Verification

build still builds, testing jobs still runs

[paulfouquet]

We should probably not trust too much the argo lint --offline templates/ workflows/ and actually test the workflows modified by this PR before merging?

build still builds, testing jobs still runs

maybe we need to run some of the workflowTemplate too?

[blacha]

We should probably not trust too much the argo lint --offline templates/ workflows/ and actually test the workflows modified by this PR before merging?

build still builds, testing jobs still runs

maybe we need to run some of the workflowTemplate too?

I agree, do we have any easy way to run tests off a pull request?

[paulfouquet]

We should probably not trust too much the argo lint --offline templates/ workflows/ and actually test the workflows modified by this PR before merging?

build still builds, testing jobs still runs

maybe we need to run some of the workflowTemplate too?

I agree, do we have any easy way to run tests off a pull request?

That would be nice to do something like what have been removed here but deleting the "test" namespace only when the PR is merged so during the time the PR is opened we can test the workflows on that namespace.

[paulfouquet]

I don't think it's necessary to apply these changes on the examples in the different readmes, but they may be inconsistent in their format now?