make use of postgres image db init script, use their variable naming … (#100)

* make use of postgres image db init script, use their variable naming scheme, make setup-wale executable so it can actually run

db/Dockerfile

@@ -9,8 +9,7 @@ RUN apt-get update \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
-ADD make_db.sh /docker-entrypoint-initdb.d/
-ADD setup-wale.sh /docker-entrypoint-initdb.d/
+COPY setup-wale.sh /docker-entrypoint-initdb.d/
 COPY docker-entrypoint1.sh /
 RUN chmod +x /docker-entrypoint1.sh