Add examples to installation

Summary:
Examples are added in release/examples directory. Each example
must have its own directory with populate.cyp file inside it.
This file contains graph creation queries written in OpenCypher.
When memgraph is built, database snapshots for each example are
created in release/examples/build directory. During memgraph
installation these snapshots are copied to share/memgraph/examples.

Reviewers: teon.banek, mferencevic

Reviewed By: teon.banek

Subscribers: pullbot

Differential Revision: https://phabricator.memgraph.io/D1036

release/examples/build_examples

@@ -0,0 +1,44 @@
+#!/bin/bash -e
+
+script_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+build_dir="build"
+query="populate.cyp"
+
+cd $script_dir
+
+if [ -d "$build_dir" ]; then
+  rm -rf "$build_dir"
+fi
+
+mkdir "$build_dir"
+
+
+for dir in queries/*/
+do
+  cd $script_dir # position to script execution dir
+
+  dir=${dir%*/}
+  example=${dir#*/}
+
+  # create snapshots directory for each example
+  snapshots_dir="$build_dir/$example"
+  mkdir -p "$snapshots_dir"
+
+  # run memgraph with durability_directory pointing
+  # to examples snapshots_dir
+  cd ../../build/
+  ./memgraph --durability-directory "$script_dir/$snapshots_dir/" \
+             --snapshot-on-exit > /dev/null 2>&1 &
+  memgraph_pid=$!
+  sleep 2 # wait for memgraph to start
+
+  cd tests/manual
+  # create data using bolt-client
+  ./bolt_client < "$script_dir/$dir/$query" > /dev/null 2>&1 || exit 1
+
+  # kill memgraph
+  kill $memgraph_pid
+
+  # wait for memgraph to terminate
+  wait $memgraph_pid
+done