vardict environment missing

[cfusterot]

The vardict environment is missing from the rules/variantcalling.snk at:

https://github.com/rng-daemon/umi-processing/blob/79a18121a9f8d95c244641477d493c649d27899b/umi-variantcalling/rules/variantcalling.snk#L34

Should be added to the env folder.