Docker on Apple Silicon: Traefik returns 404 on all web routes

[clarissecheung]

Description
When running PEcAn's Docker stack on Apple Silicon (M1/M2/M3/M4) Macs, the default Traefik image (traefik:v2.9) is built only for linux/amd64 and cannot reliably communicate with the Docker socket when running under emulation on ARM64. This causes all web routes to return 404 errors.

Workaround
Use traefik:v2.11 with platform: linux/arm64 in docker-compose.override.yml:

traefik:
  image: traefik:v2.11                
  platform: linux/arm64

Proposed Change:
Add a note to DEV-INTRO.md documenting this workaround for Apple Silicon users.

[robkooper]

we should really bump traefik to v3

[Yeligay8]

Traefik version v2.9 in your stack is built for linux/amd64 only, Apple Silicon (M1/M2/M3/M4) uses ARM64, Docker runs amd64 images via emulation (QEMU). And under emulation, Traefik fails to properly read the Docker socket.
Try to fix to:
docker-compose.override.yml
and add:
services:
traefik:
image: traefik:v2.11
platform: linux/arm64

Then restart everything again:
docker compose down
docker compose up -d