Build scripts for remote compilation of dependencies for domain-scan.zip

[konklone]

The lambda/remote_build.sh script has the commands I use to build the domain-scan Lambda environment, but it's not repeatable, and rebuilds require me to copy/paste manual subsets of the instructions.

This is going to become more of a burden over time, as any updates to dependencies will require a rebuild to capture these changes (and pshtt itself is likely to keep rapidly improving in very relevant ways), followed by a re-upload to Lambda.

[konklone]

Closes in favor of #202.