Fix release schedule again

[stefanhaller]

There's no way to tell cron to run a job on the first Saturday of a month, so we tell it to run every Saturday, and manually check whether it's the first week of the month. This is not ideal because we'll get notifications about failed releases three times a month, but it's better than nothing for now.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
Report missing for 182cefc1	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (182cefc)	Report Missing	Report Missing	Report Missing
Head commit (f7fd521)	53188	46070	86.62%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#4364)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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