v2.1.8.0

Update to Dockstore 1.9 API

• direct github apps based integration for all branch commits and tagged releases to viral-pipelines to Dockstore (skips viral-ngs-staging intermediary) using their latest API released a few days ago [#139, #140]

Workflow updates:

• fixes to NCBI Fetch_SRA_to_BAM [#138]
• new workflow classify_single (a single-sample version of classify_multi) [#133]
• new mafft_and_snp [#132, #133]
• replace all augur align calls with our own mafft invocation that is much faster [#132]
• augur_from_msa can take multiple keep_list inputs [#134]
• allow kraken2 task to take fasta input, not just bam (to allow for running on contigs) [#127]

Misc:

• various upstream docker image version updates [#126, #136, #137, #138]
• VM shape tuning [#128, #129]
• dxWDL update [#131]