add ETEX1 observations

[avaldebe]

No description provided.

[codecov]

Codecov Report

Merging #463 (4829e7c) into main-dev (daeb309) will decrease coverage by 0.00%.
The diff coverage is 61.90%.

❗ Current head 4829e7c differs from pull request most recent head 9377f8c. Consider uploading reports for the commit 9377f8c to get more accurate results

@@             Coverage Diff              @@
##           main-dev     #463      +/-   ##
============================================
- Coverage     54.57%   54.57%   -0.01%     
============================================
  Files            99      100       +1     
  Lines         20678    20729      +51     
============================================
+ Hits          11286    11313      +27     
- Misses         9392     9416      +24     

Flag	Coverage Δ
unittests	54.57% <61.90%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
pyaerocom/io/read_etex1.py	52.00% <52.00%> (ø)
pyaerocom/io/readungridded.py	72.20% <100.00%> (+0.08%)	⬆️

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