Rename GITHUB_PERSONAL_ACCESS_TOKEN to GH_TOKEN

[kevinbackhouse]

Codespace secrets are not allowed to have a name that starts with "GITHUB".

I ran this command to replace the name everywhere:

find . -type f -exec sed -i 's/GITHUB_PERSONAL_ACCESS_TOKEN/GH_TOKEN/g' {} \

[Copilot]

Pull request overview

This PR renames the GITHUB_PERSONAL_ACCESS_TOKEN environment variable to GH_TOKEN to comply with Codespaces secret naming restrictions, which prohibit secrets starting with "GITHUB".

• Replaced all occurrences of GITHUB_PERSONAL_ACCESS_TOKEN with GH_TOKEN throughout the codebase
• Updated documentation, scripts, and devcontainer configuration files

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
docker/run.sh	Updated Docker run script to pass GH_TOKEN environment variable instead of GITHUB_PERSONAL_ACCESS_TOKEN
README.md	Updated example .env configuration to show GH_TOKEN instead of GITHUB_PERSONAL_ACCESS_TOKEN
.devcontainer/post-attach.sh	Updated Codespaces validation script to check for GH_TOKEN and display the correct secret name in warning messages

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