Refine Cpp docker image and mark as GA (#4367)

* updated docker file
* added docker ignore

cpp/.dockerignore

@@ -0,0 +1,7 @@
+/*/*/.vs/
+*/build/
+*/cmake-build*/
+*/*/build/
+*/*/cmake-build*/
+*/*/*/build/
+*/*/*/cmake-build*/

cpp/Dockerfile

@@ -1,6 +1,40 @@
-# syntax=docker/dockerfile:1
-# Status: Beta
-# GA updates: https://github.com/awsdocs/aws-doc-sdk-examples/issues/4133
-FROM gcc:4.9
+# This DockerFile was copied from the AWS SDK for C++.
+# https://github.com/aws/aws-sdk-cpp/blob/master/CI/docker-file/Ubuntu/20.04/Dockerfile
+# Additional run steps were added.
+
+# Using official ubuntu docker image
+FROM ubuntu:20.04
+
+# Install git, zip, python-pip, cmake, g++, zlib, libssl, libcurl, java, maven via apt
+# Specify DEBIAN_FRONTEND and TZ to prevent tzdata hanging
+RUN apt-get update && \
+    apt-get upgrade -y && \
+    DEBIAN_FRONTEND="noninteractive" TZ="America/Los_Angeles" apt-get install -y git zip wget python3 python3-pip cmake g++ zlib1g-dev libssl-dev libcurl4-openssl-dev openjdk-8-jdk doxygen ninja-build
+
+RUN update-alternatives --install /usr/bin/python python /usr/bin/python3 10
+
+# Install maven
+RUN apt-get install -y maven
+
+# Install awscli
+#RUN pip install awscli --upgrade
+
+RUN mkdir /src
 COPY . /src/
+
+ENV SERVICES="autoscaling;ec2;iam;dynamodb;glue;lambda;monitoring;s3;sts"
+
+RUN mkdir /src/aws && \
+    cd /src/aws && \
+    git clone --recurse-submodules https://github.com/aws/aws-sdk-cpp && \
+    cd aws-sdk-cpp && \
+    mkdir build && \
+    cd build && \
+    cmake .. -DCMAKE_BUILD_TYPE=Debug -DBUILD_ONLY=${SERVICES} -DENABLE_TESTING=OFF && \
+    make && \
+    make install
+
+WORKDIR /src
+
 CMD ["bash"]
+