Add Docker fiels for xds example server and client.

Author: kannanjgithub

examples/example-xds/xds-client.Dockerfile

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+# Copyright 2024 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+#
+# Stage 1: Build XDS client
+#
+
+FROM eclipse-temurin:11-jdk AS build
+
+WORKDIR /grpc-java/examples
+COPY . .
+
+RUN cd example-xds && ../gradlew installDist -PskipCodegen=true -PskipAndroid=true
+
+#
+# Stage 2:
+#
+# - Copy only the necessary files to reduce Docker image size.
+# - Have an ENTRYPOINT script which will launch the XDS client
+#   with the given parameters.
+#
+
+FROM eclipse-temurin:11-jre
+
+WORKDIR /grpc-java/
+COPY --from=build /grpc-java/examples/example-xds/build/install/example-xds/. .
+
+# Intentionally after the COPY to force the update on each build.
+# Update Ubuntu system packages:
+RUN apt-get update \
+    && apt-get -y upgrade \
+    && apt-get -y autoremove \
+    && rm -rf /var/lib/apt/lists/*
+
+# Client
+ENTRYPOINT ["bin/xds-hello-world-client"]

examples/example-xds/xds-server.Dockerfile

@@ -0,0 +1,47 @@
+# Copyright 2024 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+#
+# Stage 1: Build XDS server
+#
+
+FROM eclipse-temurin:11-jdk AS build
+
+WORKDIR /grpc-java/examples
+COPY . .
+
+RUN cd example-xds && ../gradlew installDist -PskipCodegen=true -PskipAndroid=true
+
+#
+# Stage 2:
+#
+# - Copy only the necessary files to reduce Docker image size.
+# - Have an ENTRYPOINT script which will launch the XDS server
+#   with the given parameters.
+#
+
+FROM eclipse-temurin:11-jre
+
+WORKDIR /grpc-java/
+COPY --from=build /grpc-java/examples/example-xds/build/install/example-xds/. .
+
+# Intentionally after the COPY to force the update on each build.
+# Update Ubuntu system packages:
+RUN apt-get update \
+    && apt-get -y upgrade \
+    && apt-get -y autoremove \
+    && rm -rf /var/lib/apt/lists/*
+
+# Server
+ENTRYPOINT ["bin/xds-hello-world-server"]