fix(dragmap): Add param to nextflow schema

Author: edmundmiller

nextflow_schema.json

@@ -204,7 +204,8 @@
                     "fa_icon": "fas fa-puzzle-piece",
                     "enum": [
                         "bwa-mem",
-                        "bwa-mem2"
+                        "bwa-mem2",
+                        "dragmap"
                     ],
                     "description": "Specify aligner to be used to map reads to reference genome.",
                     "help_text": "> **WARNING** Current indices for `bwa` in AWS iGenomes are not compatible with `bwa-mem2`.\n> Use `--bwa=false` to have `Sarek` build them automatically.\n\n> **WARNING** BWA-mem2 is in active development\n> Sarek might not be able to require the right amount of resources for it at the moment\n> We recommend to use pre-built indexes",