Add git-lfs cli (#1)

Author: itai-codefresh

Dockerfile

@@ -1,6 +1,14 @@
 FROM alpine:3.5
 
-RUN apk add --update git bash
+RUN apk add --no-cache git bash
+
+# install git-lfs
+RUN apk add --no-cache --virtual deps openssl && \
+    wget -qO- https://github.com/git-lfs/git-lfs/releases/download/v2.3.4/git-lfs-linux-amd64-2.3.4.tar.gz | tar xz && \
+    mv git-lfs-*/git-lfs /usr/bin/ && \
+    rm -rf git-lfs-* && \
+    git lfs install && \
+    apk del deps
 
 #add ssh record on which ssh key to use
 COPY ./.ssh/ /root/.ssh/