Contributing.md - add Apple silicone instructions

Author: jatcwang

CONTRIBUTING.md

@@ -7,16 +7,12 @@ from JDBC driver classes definitions.
 Running the tests or building the documentation site requires connection to the example Postgres docker contains,
 which you can spin up using docker-compose:
 
-```
-docker-compose up -d --force-update
-```
-
-or
-
 ```
 docker compose up -d --force-recreate
 ```
 
+Note: If you're using Apple Silicone Macbooks, you need to enable "Use Rosetta for x86_64/amd64 emulation on Apple Silicon" since there is no ARM64 image for postgis yet.
+
 After that, in SBT you can run `test` to run tests, and `makeSite` to build the doc site
 
 If you're editing code generation related code, you should reload the SBT project and then run the `freeGen2` SBT task