ci: Install build dependencies for building agent-ctl with image pull.

Adds dependencies of 'clang' & 'protobuf' to be installed in runners
when building agent-ctl sources having image pull support.

Fixes #10400

Signed-off-by: Sumedh Alok Sharma <sumsharma@microsoft.com>

tools/packaging/static-build/tools/Dockerfile

@@ -20,6 +20,7 @@ RUN mkdir ${RUSTUP_HOME} ${CARGO_HOME} && chmod -R a+rwX ${RUSTUP_HOME} ${CARGO_
 
 RUN apk --no-cache add \
         bash \
+        clang \
         cmake \
         curl \
         gcc \