Merge pull request #2 from paulrbr-fl/master

remove uneeded external script "wait-for-it" and use 'fuser' instead

Dockerfile

@@ -4,20 +4,19 @@
 # https://github.com/GoogleChrome/puppeteer/blob/master/docs/troubleshooting.md#running-puppeteer-in-docker
 
 FROM node:10.15.3-slim@sha256:5a48598688f771a9140fdef31585dbe67b313b1e29439cbd9b81ebb25aeca517
-    
+
 RUN  apt-get update \
      # See https://crbug.com/795759
      && apt-get install -yq libgconf-2-4 \
      # Install latest chrome dev package, which installs the necessary libs to
      # make the bundled version of Chromium that Puppeteer installs work.
-     && apt-get install -y wget make --no-install-recommends \
+     # Also install system deps such as make, psmisc to have utily functions (such as fuser, peekfd)
+     && apt-get install -y wget make psmisc --no-install-recommends \
      && 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/* \
-     && wget --quiet https://raw.githubusercontent.com/vishnubob/wait-for-it/master/wait-for-it.sh -O /usr/sbin/wait-for-it.sh \
-     && chmod +x /usr/sbin/wait-for-it.sh
 
 # Tell Puppeteer to skip installing Chrome. We'll be using the installed package.
 # you'll need to launch puppeteer with: