Fix build to be triggered on push to master only

[juhoinkinen]

The previously used when clause applies only to individual steps of a pipeline

[codecov]

Codecov Report

Merging #293 into master will decrease coverage by 19.64%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master     #293       +/-   ##
===========================================
- Coverage   99.36%   79.71%   -19.65%     
===========================================
  Files          55       55               
  Lines        2845     2845               
===========================================
- Hits         2827     2268      -559     
- Misses         18      577      +559

Impacted Files	Coverage Δ
annif/backend/vw_base.py	4.34% <0%> (-95.66%)	⬇️
tests/test_backend_vw_multi.py	4.58% <0%> (-95.42%)	⬇️
annif/backend/mixins.py	0% <0%> (-93.75%)	⬇️
annif/backend/vw_multi.py	6.66% <0%> (-93.34%)	⬇️
annif/backend/vw_ensemble.py	9.43% <0%> (-90.57%)	⬇️
annif/backend/fasttext.py	8.21% <0%> (-90.42%)	⬇️
tests/test_backend_vw_ensemble.py	11.26% <0%> (-88.74%)	⬇️
annif/analyzer/voikko.py	11.76% <0%> (-88.24%)	⬇️
tests/test_backend_fasttext.py	14.28% <0%> (-85.72%)	⬇️
tests/test_analyzer_voikko.py	25% <0%> (-75%)	⬇️
... and 4 more

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