implement github actions for helm charts

[billimek]

This PR should add the necessary github actions to lint, test, and release charts as they are added and changed. This is part of the solve for https://github.com/blakeblackshear/frigate/issues/156

• For every PR impacting the helm chart, a linter will make sure that the change passes linting which includes forcing a version bump on changes)
• For every PR impacting the helm chart, a 'kubernetes in docker' (KIND) cluster will be temporarily created and the chart will be installed to that test cluster to ensure that it installs properly
• For every merge to master impacting the helm chart, automation will package the chart, update the index.yaml on the gh-pages branch, and cut a github release with the packaged chart for reference as a chart repository.

This also assumes that the gh-pages for the repo will be published to https://blakeblackshear.github.io/blakeshome-charts - if it should be different, we will need to update release.yaml as appropriate.

ACTION REQUIRED:

• Github Pages should be enabled within the repo settings. Please use the default gh-pages branch

[billimek]

@blakeblackshear this should be the first of two PRs to get the frigate chart migrated from https://github.com/k8s-at-home/charts