feat(parser): add flag to filter helm template files

[f1ames]

This PR adds Helm template files filtering needed for kubeshop/monokle-cli#24.

Changes

• Adjusted extractK8sResources() method to filter Helm template files by default.

Fixes

• None.

Remarks

Initially I used what Cloud does but recognizing Helm files based on templates string in file path or simple /values.*.(yaml|yml)/ regex seems error prone (in fact one test in validation package was already failing due to that). So I went with recognizing Helm template files based on template syntax present in file content - {{ ... }}.

Now, it's not 100% perfect because I can imagine one can have a template without any {{ ... }} (but then it will be the same as just vanilla K8s manifest, so not sure if makes any sense). It will not filter it out then but also parser will work fine not throwing errors.

The 2nd thing (and this is similar for Cloud, AFAIU), even if we pass extractHelmLikeFiles=true, template files will still error during parsing and will be filtered out... If we want to use Helm templates files further, those should have dedicated handling as forKustomize files (suggest to extract to separate issue).

Checklist

• tested locally
• added new dependencies
• updated the docs
• added a test

[changeset-bot]

🦋 Changeset detected

Latest commit: 7357bdf

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@monokle/parser	Minor

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