* Snakefile: add missing folders that are retrieved
* Snakefile: fix syntax error
* Add basic CI
* fix datafiles list to work with directories
* prepare: only add new gas pipes if augmentation not empty
* prepare: handle case where salt caverns dataframe is empty
* prepare: handle case where underwater faction not in link columns
* build_biomass: handle case where Balkan not in country list
* refer correct environment path
* fix Snakemake call
* make subworkflow dependency explicit again
* hashing pypsa-eur environment file does not seem to work
* change solver to glpk
* add data cache
* glpk without options
* try cbc
* alternative snakemake test workflow
* test: add exogenous pathways to config
* add github action ci
* only one environment update call
* line break in echo did not work
* fix syntax
* fix version syntax
* switch to glpk
* reduce time from month to week
* list environment
* use new ipopt version
https://github.com/conda-forge/ipopt-feedstock/issues/55
* remove accidental additions
* request ipopt lower than 3.13.3
https://github.com/conda-forge/ipopt-feedstock/issues/64
* add badges and release notes
* add badge to readme and make ci.yaml cc-0
