ci: do not re-run tests on master, use nightly instead

All tests are executed before merge and we allow only fast-forward merges so it is pointless to re-run them again on merge commit.

Code coverage and OBS will be done on auto-synchornized nightly branch.

added 1 commit

• fc28535d - ci: do not re-run tests on master, use nightly instead

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merged

mentioned in commit 946df935