Fix CI bugs

[christianlupus]

The auto-release CI is non-functional for two reasons:

1. The test on version trigger is not only checked on the merge message but all messages involved.
2. Signature is rejected by the app store.

This PR should cover these issues.

[codecov]

Codecov Report

Merging #447 (1f5895b) into master (69176d6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             master    #447   +/-   ##
========================================
  Coverage      0.95%   0.95%           
  Complexity      401     401           
========================================
  Files            13      13           
  Lines          1262    1262           
========================================
  Hits             12      12           
  Misses         1250    1250           

Flag	Coverage Δ	Complexity Δ
integration	0.00% <ø> (ø)	0.00 <ø> (ø)
unittests	0.95% <ø> (ø)	0.00 <ø> (ø)

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