[keyserver] Update Docker env var forwarding to reflect getCommConfig naming

Summary:
We're moving Alchemy and WalletConnect configs to getCommConfig to improve the dev experience.

Depends on D7366

Test Plan:

1. Make sure my keyserver/.env has a valid COMM_JSONCONFIG_secrets_alchemy set
2. Run my local Docker keyserver with cd keyserver && ./bash/dc.sh up --build
3. Make sure my notifs delivered by my local Docker keyserver do ENS resolution correctly
4. Make sure my local web app does ENS resolution currently

Reviewers: atul, varun, jon

Reviewed By: atul

Subscribers: tomek

Differential Revision: https://phab.comm.dev/D7367