Add git to cozy-app-dev docker container

scripts/Dockerfile

@@ -25,6 +25,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     libmozjs185-dev \
     openssl \
     imagemagick \
+    git \
   && rm -rf /var/lib/apt/lists/* \
   && mkdir /usr/src/couchdb \
   && curl -fsSL "$COUCHDB_SRC_URL" -o couchdb.tar.gz \