[CX-3001] JWT token authorisation enabled

[kshitij-partech]

This PR introduces JWT token authorization functionality to the code-push-server-go project
Contains changes across 4 files with net addition of 48 lines
The PR is currently mergeable but in an unstable state
One comment has been added to the discussion
Author is a member of the organization

[kvlad-par]

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[Copilot]

Pull request overview

This PR adds JWT-based authorization support to the Go code-push server by attempting to authenticate incoming requests using a JWT (shared secret) before falling back to the existing DB-backed token mechanism.

Changes:

• Add JWT parsing/validation path in the CheckToken middleware with fallback to DB token lookup.
• Introduce jwt_secret configuration loading into appConfig.
• Add the github.com/golang-jwt/jwt/v4 module dependency (go.mod/go.sum).

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 6 comments.

File	Description
middleware/middleware.go	Adds JWT validation attempt before existing DB token lookup in auth middleware.
config/config.go	Adds JWTSecret field and loads it from secrets (jwt_secret).
go.mod	Adds github.com/golang-jwt/jwt/v4 dependency entry.
go.sum	Adds checksum entries for the new JWT dependency.

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