Add alias for drush

Dockerfile

@@ -53,6 +53,7 @@ RUN set -eux; \
 
 COPY modprobe.sh /usr/local/bin/modprobe
 COPY docker-entrypoint.sh /usr/local/bin/
+COPY drush.sh /usr/local/bin/drush
 
 ENTRYPOINT ["docker-entrypoint.sh"]
 CMD ["sh"]
@@ -99,6 +100,5 @@ RUN mkdir -p /root/.ssh && \
     \
     ln -s /usr/local/bin/ahoy /usr/local/bin/a && \
     ln -s /usr/local/bin/composer /usr/local/bin/c && \
-    ln -s /usr/local/bin/docker-compose /usr/local/bin/d-c
-
-COPY drush.sh /usr/local/bin/drush
+    ln -s /usr/local/bin/docker-compose /usr/local/bin/d-c && \
+    ln -s /usr/local/bin/drush /usr/local/bin/d