clean docker file

Dockerfile

@@ -20,6 +20,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     sudo \
     ttf-freefont \
     vim \
+    wget \
   && rm -rf /tmp/* /var/lib/apt/lists/* \
   && apt-get purge --auto-remove
 
@@ -32,15 +33,12 @@ RUN curl -sL https://deb.nodesource.com/setup_8.x | bash - \
 # https://github.com/ebidel/try-puppeteer/blob/master/backend/Dockerfile
 # Install latest chrome dev package.
 # Note: this also installs the necessary libs so we don't need the previous RUN command.
-RUN apt-get update && apt-get install -y wget --no-install-recommends \
-    && wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add - \
+RUN wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add - \
     && sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list' \
-    && apt-get update \
-    && apt-get install -y google-chrome-unstable \
-      --no-install-recommends \
-    && rm -rf /var/lib/apt/lists/* \
+    && apt-get update && apt-get install -y --no-install-recommends \
+      google-chrome-unstable \
+    && rm -rf /tmp/* /var/lib/apt/lists/* \
     && apt-get purge --auto-remove \
-    && rm -rf /src/*.deb
 
 # Add chatie user.
 RUN groupadd -r bot && useradd -r -g bot -d /bot -m -G audio,video,sudo bot \