Update the callback server docker to also generate the Python proto definition.

PiperOrigin-RevId: 787169459
Change-Id: I197bfe8fce53149a5eea003362ad99d39ce5fd1c

Author: tooryx

Dockerfile

@@ -3,18 +3,26 @@
 FROM ghcr.io/google/tsunami-scanner-devel:latest AS build
 
 # Compile the callback server
-
 WORKDIR /usr/repos/tsunami-security-scanner-callback-server
 COPY . .
 RUN gradle shadowJar
-RUN mkdir /usr/tsunami
+RUN mkdir -p /usr/tsunami
 RUN find . -name 'tcs-main-*.jar' -exec cp {} /usr/tsunami/tsunami-tcs.jar \; \
     && cp tcs_config.yaml /usr/tsunami/tcs_config.yaml
 
+# Compile proto definitions for Python plugins
+RUN mkdir -p /usr/tsunami/py_server
+RUN python3 -m grpc_tools.protoc \
+  -I/usr/repos/tsunami-security-scanner-callback-server/proto \
+  --python_out=/usr/tsunami/py_server/ \
+  --grpc_python_out=/usr/tsunami/py_server/ \
+  /usr/repos/tsunami-security-scanner-callback-server/proto/*.proto
+
 ## Stage 2: Release
 
 FROM scratch AS release
 
 # Copy previous build results
 COPY --from=build /usr/tsunami/tsunami-tcs.jar /usr/tsunami/
 COPY --from=build /usr/tsunami/tcs_config.yaml /usr/tsunami/
+COPY --from=build /usr/tsunami/py_server/ /usr/tsunami/py_server