add automated testing to all modules (GitHub action)

[sreichl]

Setup GitHub actions for automated testing on example data and linting

https://snakemake.readthedocs.io/en/stable/snakefiles/best_practices.html#test-your-workflow-continuously

Use: https://github.com/snakemake/snakemake-github-action

See wiki for instructions

• https://github.com/epigen/unsupervised_analysis
• https://github.com/epigen/atacseq_pipeline
• https://github.com/epigen/rnaseq_pipeline
• https://github.com/epigen/fetch_ngs
• https://github.com/epigen/spilterlize_integrate
• https://github.com/epigen/dea_limma
• https://github.com/epigen/genome_tracks
• https://github.com/epigen/enrichment_analysis
• https://github.com/epigen/scrnaseq_processing_seurat
• https://github.com/epigen/dea_seurat
• https://github.com/epigen/mixscape_seurat