Add missing dependency to proto_codegen_json.sh (open-telemetry#5236)

* Add missing dependency to proto_codegen_json.sh

* Fix README

Author: ocelotl

opentelemetry-proto-json/README.rst

@@ -21,11 +21,11 @@ Code Generation
 ---------------
 
 These files were generated automatically using the custom protoc plugin opentelemetry-codegen-json_ from code in opentelemetry-proto_.
-To regenerate the code, run ``uv run ./scripts/proto_codegen_json.sh`` from the project root.
+To regenerate the code, run ``../scripts/proto_codegen_json.sh``.
 
 To build against a new release or specific commit of opentelemetry-proto_,
 update the ``PROTO_REPO_BRANCH_OR_COMMIT`` variable in
-``./scripts/proto_codegen_json.sh``. Then run the script and commit the changes
+``../scripts/proto_codegen_json.sh``. Then run the script and commit the changes
 as well as any fixes needed in the OTLP exporter.
 
 .. _opentelemetry-codegen-json: https://github.com/open-telemetry/opentelemetry-python/tree/main/codegen/opentelemetry-codegen-json

scripts/proto_codegen_json.sh

@@ -24,6 +24,7 @@ protoc() {
     uvx -c $repo_root/gen-requirements.txt \
         --python 3.12 \
         --from grpcio-tools \
+        --with "$repo_root/codegen/opentelemetry-codegen-json" \
         python -m grpc_tools.protoc "$@"
 }