The knotserver can now use alternative PLCs for DID resolution by setting the env var KNOT_SERVER_PLC_URL. The default identity directory was copied out of the at proto lib and updated to take in a target url for the PLC being used to do this. Same goes for appview with TANGLED_PLC_URL and spindle with SPINDLE_SERVER_PLC_URL This allows tangled to run on fully sandboxed atmosphere infra Co-authored-by: Shail Patel <shailpatel67@gmail.com> Co-authored-by: Seongmin Lee <git@boltless.me> Signed-off-by: Seongmin Lee <git@boltless.me>