Add a sample of MC with built-in user

management-center-built-in-user/Dockerfile

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+FROM hazelcast/management-center:latest
+
+# override start command for Management Center
+CMD ["bash", "-c", "set -euo pipefail \
+      # define a built-in user account on first start
+      && [ -f ${MC_DATA}/security.properties ] || ${MC_HOME}/mc-cli.sh create-user -H=${MC_DATA} -n=admin -p=p@ssw0rd -r=admin \
+      && if [[ \"x${JAVA_OPTS}\" != \"x\" ]]; then export JAVA_OPTS=\"${JAVA_OPTS_DEFAULT} ${JAVA_OPTS}\"; else export JAVA_OPTS=\"${JAVA_OPTS_DEFAULT}\"; fi \
+      && if [[ \"x${MIN_HEAP_SIZE}\" != \"x\" ]]; then export JAVA_OPTS=\"${JAVA_OPTS} -Xms${MIN_HEAP_SIZE}\"; fi \
+      && if [[ \"x${MAX_HEAP_SIZE}\" != \"x\" ]]; then export JAVA_OPTS=\"${JAVA_OPTS} -Xms${MAX_HEAP_SIZE}\"; fi \
+      && echo \"########################################\" \
+      && echo \"# JAVA_OPTS=${JAVA_OPTS}\" \
+      && echo \"# starting now....\" \
+      && echo \"########################################\" \
+      && set -x \
+      && exec java -server ${JAVA_OPTS} -jar ${MC_RUNTIME} \
+                ${MC_HTTP_PORT} ${MC_HTTPS_PORT} ${MC_CONTEXT} \
+     "]

management-center-built-in-user/README.md

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+# Hazelcast Management Center With Built-In User Sample
+
+In this repository, you can find a sample Docker image for Hazelcast Management Center with a built-in user account.
+
+## Prerequisites
+
+You should have installed Docker on your System.
+
+## How to Build and Run Sample Image
+
+1. Clone repo into the local.
+
+ `git clone https://github.com/hazelcast/hazelcast-docker-samples.git`
+
+2. Go to directory;
+
+`cd hazelcast-docker-samples/management-center-built-in-user/`
+
+3. Build the image using the Docker command.
+
+`docker build -t mc-built-in-user .`
+
+4. Launch a container using the Docker command.
+
+`docker run -p 8080:8080 mc-built-in-user`
+
+5. Open a browser and enter:
+
+`http://localhost:8080/hazelcast-mancenter`
+
+5. Login with this credentials:
+
+Username: `admin` Password: `p@ssw0rd`