adding seqkit version 2.8.2

[erinyoung]

There's a new version of seqkit!

According to the release notes there are some amplicon bug fixes and additional features.

After I copied the files from 2.8.1, I removed some comments and updated the software version ARG

$ diff seqkit/2.8.{1,2}/Dockerfile
1,2d0
< # FROM defines the base docker image. This command has to come first in the file
< # The 'as' keyword lets you name the folowing stage. We use `app` for the production image
6c4
< ARG SEQKIT_VER="2.8.1"
---
> ARG SEQKIT_VER="2.8.2"

Pull Request (PR) checklist:

• [X] Include a description of what is in this pull request in this message.
• [X] The dockerfile successfully builds to a test target for the user creating the PR. (i.e. docker build --tag samtools:1.15test --target test docker-builds/samtools/1.15 )
• [X] Directory structure as name of the tool in lower case with special characters removed with a subdirectory of the version number (i.e. spades/3.12.0/Dockerfile)
  • [X] (optional) All test files are located in same directory as the Dockerfile (i.e. shigatyper/2.0.1/test.sh)
• [X] Create a simple container-specific README.md in the same directory as the Dockerfile (i.e. spades/3.12.0/README.md)
  • [X] If this README is longer than 30 lines, there is an explanation as to why more detail was needed
• [X] Dockerfile includes the recommended LABELS
• [X] Main README.md has been updated to include the tool and/or version of the dockerfile(s) in this PR
• [X] Program_Licenses.md contains the tool(s) used in this PR and has been updated for any missing