build: fix gitops workflow to avoid building wheels in push to main

[codecov[bot]]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (7d0108f) 92.79% compared to head (0013b64) 94.40%. Report is 20 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #44 +/- ## ========================================== + Coverage 92.79% 94.40% +1.61% ========================================== Files 6 6 Lines 972 930 -42 ========================================== - Hits 902 878 -24 + Misses 70 52 -18 ``` | [Files](https://app.codecov.io/gh/martibosch/pylandstats/pull/44?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Mart%C3%AD+Bosch) | Coverage Δ | | |---|---|---| | [pylandstats/\_\_init\_\_.py](https://app.codecov.io/gh/martibosch/pylandstats/pull/44?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Mart%C3%AD+Bosch#diff-cHlsYW5kc3RhdHMvX19pbml0X18ucHk=) | `100.00% <100.00%> (ø)` | | | [pylandstats/landscape.py](https://app.codecov.io/gh/martibosch/pylandstats/pull/44?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Mart%C3%AD+Bosch#diff-cHlsYW5kc3RhdHMvbGFuZHNjYXBlLnB5) | `95.07% <100.00%> (+0.18%)` | :arrow_up: | | [pylandstats/multilandscape.py](https://app.codecov.io/gh/martibosch/pylandstats/pull/44?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Mart%C3%AD+Bosch#diff-cHlsYW5kc3RhdHMvbXVsdGlsYW5kc2NhcGUucHk=) | `97.14% <100.00%> (+0.68%)` | :arrow_up: | | [pylandstats/settings.py](https://app.codecov.io/gh/martibosch/pylandstats/pull/44?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Mart%C3%AD+Bosch#diff-cHlsYW5kc3RhdHMvc2V0dGluZ3MucHk=) | `100.00% <ø> (ø)` | | | [pylandstats/spatiotemporal.py](https://app.codecov.io/gh/martibosch/pylandstats/pull/44?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Mart%C3%AD+Bosch#diff-cHlsYW5kc3RhdHMvc3BhdGlvdGVtcG9yYWwucHk=) | `96.37% <100.00%> (+1.69%)` | :arrow_up: | | [pylandstats/zonal.py](https://app.codecov.io/gh/martibosch/pylandstats/pull/44?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Mart%C3%AD+Bosch#diff-cHlsYW5kc3RhdHMvem9uYWwucHk=) | `86.17% <92.94%> (+2.59%)` | :arrow_up: |

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