now npm and node are properly set

Dockerfile

@@ -1,20 +1,36 @@
 FROM debian
 
-# Install prerequirements or NVM
-RUN apt-get update \
-    && apt-get install -y \
-        curl \
+# Replace shell with bash so we can source files
+RUN rm /bin/sh && ln -s /bin/bash /bin/sh
+
+# Set debconf to run non-interactively
+RUN echo 'debconf debconf/frontend select Noninteractive' | debconf-set-selections
+
+# Install base dependencies
+RUN apt-get update && apt-get install -y -q --no-install-recommends \
+        apt-transport-https \
         build-essential \
-        python
+        ca-certificates \
+        curl \
+        git \
+        libssl-dev \
+        python \
+        rsync \
+        software-properties-common \
+        wget \
+    && rm -rf /var/lib/apt/lists/*
 
-# Install NVM with node
-RUN curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.30.1/install.sh | NVM_DIR="/nvm" bash \
-    && bash -c "source /nvm/nvm.sh \
-    && nvm install 4.3.1 \
-    && nvm alias default v4.3.1"
+ENV NVM_DIR /usr/local/nvm
+ENV NODE_VERSION 4.3.1
 
-ADD .bashrc /.bashrc
+# Install nvm with node and npm
+RUN curl https://raw.githubusercontent.com/creationix/nvm/v0.31.0/install.sh | bash \
+    && source $NVM_DIR/nvm.sh \
+    && nvm install $NODE_VERSION \
+    && nvm alias default $NODE_VERSION \
+    && nvm use default
 
-ENV BASH_ENV /.bashrc
-
-RUN ln -snf /bin/bash /bin/sh
+ENV NODE_PATH $NVM_DIR/v$NODE_VERSION/lib/node_modules
+ENV PATH      $NVM_DIR/versions/node/v$NODE_VERSION/bin:$PATH
+RUN node -v
+RUN npm -v