[ericcurtin]

Summary

GitHub App token refresh fails because GitHub answers form-encoded unless asked for JSON. Send Accept: application/json.

Related Issue

Closes #4356

Changes

• Add the Accept header in request_token.
• Add a unit test that only matches when the header is present.

Testing

• Checks appropriate to the affected code and behavior pass
• Unit tests added/updated (if applicable)
• E2E tests added/updated (if applicable)

Ran cargo fmt --check, cargo clippy -p openshell-server --all-targets -- -D warnings, and cargo test -p openshell-server --lib provider_refresh.

Checklist

• Follows Conventional Commits
• Commits are signed off (DCO)
• Architecture docs updated (if applicable)

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[ericcurtin]

@mrunalp @derekwaynecarr PTAL, and /ok to test b55cbfdc9f5e39fcb6ebcf11bb076ad4e51d2373 if it looks good. Thank you!

[mrunalp]

/ok to test b55cbfd

[github-actions]

Label test:e2e applied for b55cbfd. Open the existing run and click Re-run all jobs to execute with the label set. The run will execute the standard E2E suite after building the required gateway, sandbox, and supervisor images once. The matching required CI gate status on this PR will flip green automatically once the run finishes.