feat: enable UI config overrides post build

[rajasekharreddyparvatha]

Signed-off-by: rajasekhar reddy reddy.rajasekhar.parvatha@gmail.com

Summary of Changes

Currently the Amundsen frontend needs to be rebuilt for any config change (example: enabling dashboards, enabling ML features etc)

This feature allows this frontend appConfig to be overriden by an externally injected js file (example: via helmchart volume mounts, docker-compose volumes etc)

This will make it easier to run amundsen with custom config without the need to rebuild from source.

Sample External config js file

Create new js file with name as config-external.js in static directory as below
filename : config-external.js

window['configExternal'] = {
  badges: {},
  browse: {
    curatedTags: [],
    showAllTags: true,
    showBadgesInHome: true,
  },
  date: {
    default: 'MMM DD, YYYY',
    dateTimeShort: 'MMM DD, YYYY ha z',
    dateTimeLong: 'MMMM Do YYYY [at] h:mm:ss a',
  },
  editableText: {
    tableDescLength: 750,
    columnDescLength: 250,
  },
  analytics: {
    plugins: [],
  },
  indexDashboards: {
    enabled: false,
  }
}

Tests

Documentation

CheckList

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[Golodhros]

LGTM

[feng-tao]

could we update the pr description so that everyone is aware of the change?

[aneesh-joseph]

@feng-tao , done . can you please help run the PR tests

[boring-cyborg]

Awesome work, congrats on your first merged pull request!