contrib,nix: local, sandboxed atmosphere infra
Add sandboxed atmosphere environment for local testing. This new vm
contains everything required to run local test appview including PLC,
PDS, Jetstream (listening to single PDS), knot and spindle.
I'm using my custom `tngl.boltless.dev` domain which resolves to
`127.0.0.1` without any proxy.
PLC: plc.tngl.boltless.dev
PDS: pds.tngl.boltless.dev
Jetstream: jetstream.tngl.boltless.dev
Knot: knot.tngl.boltless.dev
Spindle: spindle.tngl.boltless.dev
TLS is supported with caddy service running inside the vm.
note: `pds.env` file here is hard copy to be used for contrib/scripts.
note: upgraded pds package in order to set email settings
Signed-off-by: Seongmin Lee <git@boltless.me>