[VI-1120] Load IdentitySettings secrets

[rileyanderson]

Summary

• Load Identity secrets into IdentitySettings from the ENV

Related issue(s)

• https://jira.devops.va.gov/browse/VI-1120

Testing

• Start rails console with env var IDENTITY_SETTINGS__IDME__CLIENT_SECRET=some-secret

   IDENTITY_SETTINGS__IDME__CLIENT_SECRET=some-secret rails c

• Check setting

  IdentitySettings.idme.client_secret

What areas of the site does it impact?

IdentitySettings

Acceptance criteria

• I fixed|updated|added unit tests and integration tests for each feature (if applicable).
• No error nor warning in the console.
• No sensitive information (i.e. PII/credentials/internal URLs/etc.) is captured in logging, hardcoded, or specs

[github-actions]

1 Warning

⚠️

This PR changes 282 LoC (not counting whitespace/newlines). In order to ensure each PR receives the proper attention it deserves, we recommend not exceeding 200. Expect some delays getting reviews. File Summary Files .github/CODEOWNERS (+2/-0) .gitignore (+2/-1) config/identity_settings/environments/dev.yml (+50/-0) config/identity_settings/environments/localhost.yml (+2/-0) config/identity_settings/environments/production.yml (+70/-0) config/identity_settings/environments/staging.yml (+56/-0) config/identity_settings/settings.yml (+89/-0) config/initializers/identity_config.rb (+10/-0) Note: We exclude files matching the following when considering PR size: *.csv, *.json, *.tsv, *.txt, *.md, Gemfile.lock, app/swagger, modules/mobile/docs, spec/fixtures/, spec/support/vcr_cassettes/, modules/mobile/spec/support/vcr_cassettes/, db/seeds, modules/vaos/app/docs, modules/meb_api/app/docs, modules/appeals_api/app/swagger/, *.bru, *.pdf Big PRs are difficult to review, often become stale, and cause delays.

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