Feature/#45 Finish helm chart for API

[kylejwatson]

Description

• Remove devlake dependency from the helm chart and just add it to the deployment steps as a separate helm chart.
• Set sane defaults for the values used to pull and deploy the docker image.
• Add documentation on how to set different values for different setups.
• Add a workflow to publish the chart on release.

Tested workflow successfully.

Issue

This PR addresses issue #45.

Contribution Checklist:

• [x] The pull request only addresses one issue or adds one feature.
• [x] The pull request does not introduce any breaking changes
• [x] I have added screenshots or gifs to help explain the change if applicable.
• [x] I have read the contribution guidelines.
• [x] I have ran the linting and formatting scripts to make sure the code is consistently styled.
• [x] I have built/compiled and ran the tests to make sure the code works correctly.
• [x] I have added or changed tests to cover new or different functionality, where applicable.
• [x] Create an issue and link to the pull request.

Note: Keeping the PR small and focused helps make it easier to review and merge. If you have multiple changes you want to make, please consider submitting them as separate pull requests.

[goposky]

Why/where is this happening?

https://github.com/DevoteamNL/opendora/actions/runs/7193556113

build Error while fetching latest Helm release: Error: [@octokit/auth-action] GITHUB_TOKEN variable is not set. It must be set on either env: or with:. See https://github.com/octokit/auth-action.js#createactionauth. Using default version v3.9.0

[kylejwatson]

Why/where is this happening?

https://github.com/DevoteamNL/opendora/actions/runs/7193556113

build Error while fetching latest Helm release: Error: [@octokit/auth-action] GITHUB_TOKEN variable is not set. It must be set on either env: or with:. See https://github.com/octokit/auth-action.js#createactionauth. Using default version v3.9.0

I believe it's a warning from azure/setup-helm@v3, will look into their issues but it seems to be non-breaking. Will also look into helm chart linting 👍