Pin Dynamo precheck script download to release tag instead of main

[Copilot]

Downloading the pre-deployment check script from main is a supply-chain risk and breaks reproducibility if the upstream script changes between runs.

Change

• Pin the precheck script URL to v${DYNAMO_VERSION} instead of main, matching the Helm chart version already used for the Dynamo platform installation

# Before
local precheck_url="https://raw.githubusercontent.com/ai-dynamo/dynamo/main/deploy/pre-deployment/pre-deployment-check.sh"

# After
local precheck_url="https://raw.githubusercontent.com/ai-dynamo/dynamo/v${DYNAMO_VERSION}/deploy/pre-deployment/pre-deployment-check.sh"

DYNAMO_VERSION already defaults to 1.0.1 at script initialization, so the URL is always well-formed.

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/ai-dynamo/dynamo/tags
  • Triggering command: /usr/bin/curl curl -fsSL REDACTED (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)