Environment names may have unicodes, so don't blow up

[mattrobenolt]

Fixes SENTRY-1X6

@getsentry/infrastructure

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This change is

[mattrobenolt]

https://sentry.io/sentry/sentry/issues/155628872/

[tkaemming]

Reviewed 1 of 1 files at r1.
Review status: all files reviewed at latest revision, 1 unresolved discussion.

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src/sentry/models/grouprelease.py, line 35 [r1] (raw file):

        return 'grouprelease:1:{}:{}'.format(
            group_id,
            md5_text(u'{}:{}'.format(release_id, environment)).hexdigest(),

Wonder how hard it'd be to write a linter to warn if calling .format on a string literal…

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