Runner cache does not preserve symlink mtime

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Summary

Runner Cache does not preserve symlinks' mtime between runs

Steps to reproduce

just one script step: ls -l node_modules/.bin/nopt

• First run of job -> time 12:14

Running before_script and script
 $ ls -l node_modules/.bin/nopt
lrwxrwxrwx. 1 root root 19 May 21 12:14 node_modules/.bin/nopt -> ../nopt/bin/nopt.js

Saving cache
Created cache

• Second run of job -> time 12:15

Restoring cache
Successfully extracted cache

Running before_script and script
 $ ls -l node_modules/.bin/nopt || true
lrwxrwxrwx. 1 root root 19 May 21 12:15 node_modules/.bin/nopt -> ../nopt/bin/nopt.js

What is the current bug behavior?

mtime of symlink doesn't get preserved between cache restoring and saving

What is the expected correct behavior?

mtime of unchanged symlink stays the same between job runs