PHP Docker usage examples

[macielcr7]

when you run any example using the configuration docker

E0201 16:23:53.596260122     170 thread_pool.cc:253]                   Waiting for thread pool to idle before forking
E0201 16:23:56.596381093     170 thread_pool.cc:253]                   Waiting for thread pool to idle before forking
E0201 16:23:59.596502744     170 thread_pool.cc:253]                   Waiting for thread pool to idle before forking

[evan-hines-js]

I had the same issues. Updating line 19 of the the Dockerfile to pull a grpc release before 1.51 works. 1.51 had a bug regarding forks.
grpc/grpc#31772

-RUN pecl install protobuf-${PROTOBUF_VERSION} grpc \
+RUN pecl install protobuf-${PROTOBUF_VERSION} grpc-1.49.0 \