ci: disable lockfile generation

[fulls1z3]

** PR Checklist Please check if your PR fulfills the following requirements:

• [x] The commit message follows our guidelines: https://github.com/fulls1z3/ngx-meta/blob/master/CONTRIBUTING.md#commit
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

** PR Type What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[x] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

** What is the current behavior?

Issue Number: N/A

** What is the new behavior?

** Does this PR introduce a breaking change?

[ ] Yes
[x] No

** Other information

[codecov[bot]]

Codecov Report

Merging #84 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #84   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5      5           
  Lines         175    175           
  Branches       65     65           
=====================================
  Hits          175    175

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