Fix publish workflow

[CasperWA]

No description provided.

[codecov]

Codecov Report

Merging #352 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #352   +/-   ##
=======================================
  Coverage   90.59%   90.59%           
=======================================
  Files          55       55           
  Lines        2276     2276           
=======================================
  Hits         2062     2062           
  Misses        214      214           

Flag	Coverage Δ
#unittests	90.59% <ø> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update bf4f3bb...afec1e4. Read the comment docs.

[CasperWA]

To make sure the "push" environment variable exists it is first set to "0" and subsequently to "1" if changes were committed.