feat: add external authorization service (authzd) with JWT authentication

- Add new authzd gRPC service implementing Envoy's external authorization API
- Integrate JWT authentication filter in Envoy configuration with claim extraction
- Update middleware to support both cookie-based and header-based user authentication
- Add comprehensive test coverage for authorization service and server
- Configure proper service orchestration with authzd, sparkled, and Envoy
- Update build system and Docker configuration for multi-service deployment
- Add grpcurl tool for gRPC service debugging and testing

This enables fine-grained authorization control through Envoy's ext_authz filter
while maintaining backward compatibility with existing cookie-based authentication.

1 files changed, 25 insertions, 0 deletions

diff --git a/vendor/cel.dev/expr/CODE_OF_CONDUCT.md b/vendor/cel.dev/expr/CODE_OF_CONDUCT.md
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index 0000000..59908e2
--- /dev/null
+++ b/vendor/cel.dev/expr/CODE_OF_CONDUCT.md
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+# Contributor Code of Conduct
+## Version 0.1.1 (adapted from 0.3b-angular)
+
+As contributors and maintainers of the Common Expression Language
+(CEL) project, we pledge to respect everyone who contributes by
+posting issues, updating documentation, submitting pull requests,
+providing feedback in comments, and any other activities.
+
+Communication through any of CEL's channels (GitHub, Gitter, IRC,
+mailing lists, Google+, Twitter, etc.) must be constructive and never
+resort to personal attacks, trolling, public or private harassment,
+insults, or other unprofessional conduct.
+
+We promise to extend courtesy and respect to everyone involved in this
+project regardless of gender, gender identity, sexual orientation,
+disability, age, race, ethnicity, religion, or level of experience. We
+expect anyone contributing to the project to do the same.
+
+If any member of the community violates this code of conduct, the
+maintainers of the CEL project may take action, removing issues,
+comments, and PRs or blocking accounts as deemed appropriate.
+
+If you are subject to or witness unacceptable behavior, or have any
+other concerns, please email us at
+[cel-conduct@google.com](mailto:cel-conduct@google.com).