Dockerfile: add bash in preparation of ngram support

Signed-off-by: Silvio Fricke <silvio.fricke@gmail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/Dockerfile b/Dockerfile
index f983d9e..0e7be21 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -9,6 +9,7 @@ RUN set -ex \
     && apt-get clean \
     && apt-get update -y \
     && apt-get -t jessie-backports install -y \
+        bash \
         openjdk-8-jre-headless \
         unzip