Dockerfile to test that debian packages can be used with ruby instead of make install

tools/dockerfile/grpc_ruby_deb/Dockerfile

+# Dockerfile for gRPC Ruby, but using Debian packages for gRPC C core.
+FROM grpc/ruby_base
+
+# Pull the latest sources
+RUN cd /var/local/git/grpc \
+  && git pull --recurse-submodules \
+  && git submodule update --init --recursive
+
+# Make sure we don't rely on things that shouldn't be there.
+RUN make clean -C /var/local/git/grpc
+
+# Debian packages need to be supplied externally
+ADD libgrpc_amd64.deb libgrpc_amd64.deb
+ADD libgrpc-dev_amd64.deb libgrpc-dev_amd64.deb
+
+# Install the C core .deb packages
+RUN /bin/bash -l -c 'dpkg -i libgrpc_amd64.deb libgrpc-dev_amd64.deb'
+
+# Build ruby gRPC and run its tests
+RUN /bin/bash -l -c 'cd /var/local/git/grpc/src/ruby && bundle && rake'
+
+# Add a cacerts directory containing the Google root pem file, allowing the
+# ruby client to access the production test instance
+ADD cacerts cacerts
+
+# Add a service_account directory containing the auth creds file
+ADD service_account service_account
+
+# Specify the default command such that the interop server runs on its known
+# testing port
+CMD ["/bin/bash", "-l", "-c", "ruby /var/local/git/grpc/src/ruby/bin/interop/interop_server.rb --use_tls --port 8060"]

tools/dockerfile/grpc_ruby_deb/README.md

+GRPC RUBY Base Dockerfile (Debian package version)
+========================
+
+Dockerfile for creating the Ruby gRPC development Docker instance.
+Uses gRPC C core Debian packages instead of installing it using make.