Docker: Add a Dockerfile and Makefile targets (#373)

* add docker build option

* add docker section in makefile

* add bash_aliases to get different prompt

docker/entrypoint.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+USER_NAME=blogos
+USER_UID=${LOCAL_UID:-9001}
+USER_GID=${LOCAL_GID:-9001}
+
+groupadd --non-unique --gid $USER_GID $USER_NAME
+useradd --non-unique --create-home --uid $USER_UID --gid $USER_GID $USER_NAME
+
+export HOME=/home/$USER_NAME
+
+TESTFILE=$RUSTUP_HOME/settings.toml
+CACHED_UID=$(stat -c "%u" $TESTFILE)
+CACHED_GID=$(stat -c "%g" $TESTFILE)
+
+if [ $CACHED_UID != $USER_UID  ] || [ $USER_GID != $CACHED_GID  ]; then
+    chown $USER_UID:$USER_GID -R $CARGO_HOME $RUSTUP_HOME
+fi
+
+exec gosu $USER_NAME "$@"