feat: add --skipTag flag

[mpsanchis]

It would be useful to use the semver plugin as a version calculator, and then use the calculated ${version} or ${tag} at a later stage. For instance, run it at the beginning of a pipeline to get the version, and then use that version to build packages, images, charts, etc.
I have added a skipTag flag that allows running the plugin and not tagging the latest commit. In combination with skipCommit and skipProjectChangelog, one can run the plugin without modifying the repository.

An alternative would be to use dryRun, but this doesn't allow calling post targets.

[codecov]

Codecov Report

Merging #687 (83c4392) into main (34c931a) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #687   +/-   ##
=======================================
  Coverage   96.78%   96.78%           
=======================================
  Files          28       28           
  Lines         591      591           
  Branches      100      100           
=======================================
  Hits          572      572           
  Misses          9        9           
  Partials       10       10           

Impacted Files	Coverage Δ
packages/semver/src/executors/version/index.ts	98.24% <ø> (ø)
packages/semver/src/executors/version/version.ts	100.00% <ø> (ø)
packages/semver/src/executors/version/utils/git.ts	91.83% <100.00%> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[gazal-k]

Thank you for this PR. I think we would need similar capability.

It would be useful to use the semver plugin as a version calculator, and then use the calculated ${version} or ${tag} at a later stage

How would you use this calculated version for other steps? And how would you ensure the same version is then used for creating the tag & a "release" on GitHub?

[mpsanchis]

How would you use this calculated version for other steps?

I am already doing it with another home-made nx plugin. The version is stored as an environment variable, and other programs that publish packages/images/charts use that version in the registries they publish to.

how would you ensure the same version is then used for creating the tag & a "release" on GitHub?

Unfortunately, as of now, nx doesn't support passing options as env vars to executors, so some of them (such as ngx-deploy-npm:deploy and @jscutlery/semver:gitlab) must be post-targets. This means (for now) calling @jscutlery/semver:version twice (one for version calculation, and one for passing the version to the post-targets that cannot read env vars)