fix(docker): fix docker entrypoint

close https://github.com/SpaceVim/SpaceVim/issues/4681

docker/Dockerfile

@@ -3,7 +3,15 @@ FROM debian:stable
 MAINTAINER Shidong Wang <wsdjeg@outlook.com>
 
 RUN apt-get update && \
-    apt-get install -y neovim curl python3 python3-pip lua5.3 git exuberant-ctags silversearcher-ag && \
+    apt-get install -y \
+    neovim \
+    curl \
+    python3 \
+    python3-pip \
+    lua5.3 \
+    git \
+    exuberant-ctags \
+    silversearcher-ag && \
     apt-get clean
 
 ENV HOME /home/spacevim
@@ -17,11 +25,12 @@ RUN groupdel users                                              \
 USER spacevim
 
 WORKDIR $HOME
-ENV PATH "$HOME/.local/bin:${PATH}"
+
+ENV PYTHON3_HOST_PROG "/usr/bin/python3"
 
 RUN mkdir -p $HOME/.config $HOME/.SpaceVim.d
 
-RUN pip install --user neovim pipenv
+RUN pip install --user pynvim
 
 RUN curl https://raw.githubusercontent.com/SpaceVim/SpaceVim/master/docker/init.toml > $HOME/.SpaceVim.d/init.toml
 
@@ -31,4 +40,4 @@ RUN nvim --headless +'call dein#install#_update([], "install", v:false)' +qall
 
 RUN rm $HOME/.SpaceVim.d/init.toml
 
-ENTRYPOINT /usr/local/bin/nvim
+ENTRYPOINT nvim