--append-rules from S3 bucket

[mrpackethead]

This is a feature request,

It would be really nice if we could specify an S3 bucket for --append-rules. This would make it easy to share custom rules across our organisation / codebuilder

[mrpackethead]

This is What I ended up doign with my Buildspec. AS you can see its copying some files across from S3. I have another pipleine that migrates the contents of a Repo to the S3 bucket, when they are committed. The S3 bucket is available for our team to read, so they can use our custom rules.
I imagine something like this;

cfn-lint template.yaml --append-rules-from-s3 s3://s3bucketname --profile my-aws-profile

I will have a look at the source, this might not be so hard to implement myself.

BuildSpec: |
            version: 0.2
            phases:
              install:
                commands: 
                  - pip install cfn-lint
                  - mkdir msrules
                  - cd msrules
                  - aws s3 cp s3://cfn-lint-rules . --recursive
                  - cd ..
              build:
                commands:
                  - cfn-lint template.yaml --append-rules msrules
            artifacts:
              type: zip
              discard-paths: yes
              files: template.yaml

[PatMyron]

Going to lean on the side of Unix philosophy where other tools solve fetching remote files better, especially if handling credentials, and I'd recommend the solution you landed on

similar issues: aws-cloudformation/cloudformation-guard#24, #1094