Fix: use mage env with goreleaser

[mtojek]

This PR fixes the issue introduced in #455. Most likely it uses default go binary which is 1.15.

I was wrong with the assumption: #455 (comment) .

[elasticmachine]

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• Start Time: 2021-08-02T16:35:48.199+0000

• Duration: 24 min 43 sec

• Commit: debee57

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Total	320

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[mtojek]

I will merge this one to see if it improves the situation.