Add github actions testing pipeline

[dfornika]

Fixes #30

[dfornika]

The following is implemented:

• We download the H37Rv reference sequence and simulate reads from it using ART at depth 12x
• We use a vcf file that was generated from a resistant library found on the SRA (ERR1664619), and apply mutations to H37Rv to generate a muated genome, then simulate reads from that at 12x
• We run both samples through the pipeline
• We check that the provenance files conform to our provenance schema
• We check that the expected mutations are found for all samples (none for H37Rv, several for the SRA library)

We can consider adding more tests but the overall structure is now in-place.