Design .samrc

[jfuss]

Describe your idea/feature/enhancement

SAMRC is a configuration file that customers can use to lessen common options and values from the command line. One example of this, would be to override where SAM CLI will cache Lambda Layers it downloads to use for locally invoking. This would allow a customer to change the default location to something they desire without needing to always add it to every command.

Proposal

TBD.

Additional Details

[sanathkr]

#689 should be revived once we have a design done.

[jfuss]

This comment is very relevant here: #1272 (comment). Attaching here so we don't loose @henrikbjorn perspective

[awsjeffg]

This is now done, closing.