chore: allow nextVersion to be overridden by NEXT_VERSION

[flotwig]

By popular demand!

If defined, NEXT_VERSION acts the same as the old NEXT_DEV_VERSION environment variable. Otherwise, semantic commits are used.

Generally, if you want to build a higher version number, you can just add a commit with the correct semantic commit message. But there's no way to build a lower version number without using NEXT_VERSION.

[cypress-bot]

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[cypress]

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Test summary

9392 • 0 • 119 • 3 • 1

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Run details

Project	cypress
Status	Passed
Commit	2872a35
Started	Mar 17, 2021 5:32 PM
Ended	Mar 17, 2021 5:42 PM
Duration	10:39 💡
OS	Linux Debian - 10.5
Browser	Multiple

View run in Cypress Dashboard ➡️

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Flakiness

	cypress/integration/retries.ui.spec.js		1
1	runner/cypress retries.ui.spec > opens attempt on each attempt failure for the screenshot, and closes after test passes

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[jennifer-shehane]

I endorse this message.