Fix local collator node start error on Apple Silicon M1/M2 (arm64)

[Dmitri]

To Do

• Fix make commands that use docker that need --platform linux/amd64
• Update docker file readmes and other docker documentation to mention ^ for easy reference

Original Issue

Starting local collator node via docker results in the following error on M1 (see below). Works on an Intel Mac.

$ make start-frequency-docker
---
Attaching to frequency
frequency  | curl: (7) Failed to connect to relay_alice port 9933: Connection refused
frequency  | failed to get id for relay_alice
frequency  | curl: (7) Failed to connect to relay_bob port 9933: Connection refused
frequency  | failed to get id for relay_bob
frequency exited with code 1

Solution Notes

The fix here is one of these:

1. Set the platform in the docker command to force it to use --platform linux/amd64
2. arm64 images Related: #779

Since it is not an issue to have --platform linux/amd64 even on linux amd64, it is a straightforward fix.

[Patrick]

closing duped