Add Dockerfile for csv_to_snapshot packaging.

Summary:
C++ implementation of CSV to Memgraph's snapshot file is much more efficient then
the Python implementation. It includes a huge part of the Memgraph's source
code and the code has to be compiled (which is not easy). Because of that it
has to be packaged.

Reviewers: teon.banek, mferencevic

Reviewed By: teon.banek

Subscribers: pullbot

Differential Revision: https://phabricator.memgraph.io/D854

tools/.gitignore

@@ -1,2 +1,2 @@
-build
+build/
 csv_to_snapshot

tools/csv_to_snapshot.dockerfile

@@ -0,0 +1,22 @@
+FROM debian:stretch
+
+COPY csv_to_snapshot /usr/local/bin/csv_to_snapshot
+
+# Setup memgraph user and group.
+RUN groupadd -r memgraph
+RUN useradd -lrm -g memgraph memgraph
+
+# Setup intput/output directory.
+# /data is used because that's the shortest way to reference the directory.
+RUN mkdir -p /data
+RUN chown -R memgraph:memgraph /data
+
+# Change user and set working directory.
+USER memgraph:memgraph
+VOLUME /data
+WORKDIR /data
+
+ENTRYPOINT ["csv_to_snapshot"]
+# Print help and usage by default, since at least one --nodes argument is
+# required.
+CMD ["--help"]