Include git support in docker container

Author: laurent-verbruggen-at-kbc

Dockerfile

@@ -4,8 +4,12 @@ RUN apk --update add \
   ca-certificates \
   bash \
   jq \
-  oniguruma \
-  curl
+  curl \
+  git
+
+# can't `git pull` unless we set these
+RUN git config --global user.email "git@localhost" && \
+    git config --global user.name "git"
 
 ADD assets/ /opt/resource/
 RUN chmod +x /opt/resource/*