feat(github): honor the raw media type on GET /repos/:owner/:repo/contents/:path

[yonatangross]

Summary

• GET /repos/:owner/:repo/contents/:path returns the file bytes with Content-Type: application/vnd.github.raw when the request accepts application/vnd.github.raw or application/vnd.github.raw+json, as GitHub does; the JSON envelope is unchanged for every other Accept
• Symlinks resolve like the existing /:owner/:repo/raw/:ref/:path route

Why

Clients that read files this way (a get_file_content() sending the raw media type, the documented GitHub pattern) got the base64 JSON envelope from the emulator where production returns text. Found by Yonatan-HQ/platform's emulate tier driving its real GitHub service against 0.10.0's stateful contents API.

Changes

File	Change
routes/contents.ts	raw media-type branch in getContents
__tests__/contents-commits.test.ts	PUT a file, GET with .raw+json → bytes + application/vnd.github.raw; default Accept still returns encoding: base64

Test plan

• pnpm --filter @emulators/github test (6 files pass)
• pnpm -r build
• pnpm --filter @emulators/github lint (0 errors, no new warnings)

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[vercel]

Suggested change

	// Raw media type (`application/vnd.github.raw` / `.raw+json`): return the
	// file bytes, as GitHub does, instead of the JSON envelope.
	const accept = c.req.header("Accept") ?? "";
	if (/application\/vnd\.github\.raw(\+json)?/i.test(accept)) {
	// Raw media type (`application/vnd.github.raw` / `.raw+json` / the
	// versioned `.v3.raw` sent by Octokit's `mediaType: { format: "raw" }`):
	// return the file bytes, as GitHub does, instead of the JSON envelope.
	const accept = c.req.header("Accept") ?? "";
	if (/application\/vnd\.github(?:\.v3)?\.raw(\+json)?/i.test(accept)) {

Raw content Accept-header regex misses the versioned application/vnd.github.v3.raw media type sent by default Octokit clients, so they receive the JSON envelope instead of raw bytes.