[BUG] ci-workflow generator not working for gitlab

[gperdomor]

Current Behavior

Using @nrwl/workspace:ci-workflow with gitlab throws error

NX Property 'ci' does not match the schema. 'gitlab' should be one of github,circleci,azure,bitbucket-pipelines.

Expected Behavior

Should generate a gitlab-ci.yml file

GitHub Repo

No response

Steps to Reproduce

1. Just create a new workspace
2. Run npx nx generate @nrwl/workspace:ci-workflow --ci=gitlab --no-interactive --dry-run

Nx Report

>  NX   Report complete - copy this into the issue template

   Node : 18.13.0
   OS   : darwin x64
   npm  : 8.19.3
   
   nx : 15.6.2
   @nrwl/angular : Not Found
   @nrwl/cypress : Not Found
   @nrwl/detox : Not Found
   @nrwl/devkit : 15.6.2
   @nrwl/esbuild : Not Found
   @nrwl/eslint-plugin-nx : Not Found
   @nrwl/expo : Not Found
   @nrwl/express : Not Found
   @nrwl/jest : Not Found
   @nrwl/js : Not Found
   @nrwl/linter : 15.6.2
   @nrwl/nest : Not Found
   @nrwl/next : Not Found
   @nrwl/node : Not Found
   @nrwl/nx-cloud : 15.0.2
   @nrwl/nx-plugin : Not Found
   @nrwl/react : Not Found
   @nrwl/react-native : Not Found
   @nrwl/rollup : Not Found
   @nrwl/schematics : Not Found
   @nrwl/storybook : Not Found
   @nrwl/web : Not Found
   @nrwl/webpack : Not Found
   @nrwl/workspace : 15.6.2
   @nrwl/vite : Not Found
   typescript : 4.8.4
   ---------------------------------------
   Local workspace plugins:
   ---------------------------------------
   Community plugins:

Failure Logs

>  NX   Property 'ci' does not match the schema. 'gitlab' should be one of github,circleci,azure,bitbucket-pipelines.

Additional Information

No response

[github-actions]

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