Added example of Dockerfile

Dockerfile

@@ -0,0 +1,24 @@
+FROM node:alpine
+
+RUN set -eux; \
+  apk add --no-cache \
+    bash \
+    tini \
+    openssh-client \
+    'chromium=~79'
+
+ENV PUPPETEER_SKIP_CHROMIUM_DOWNLOAD true
+ENV CHROME_BIN /usr/bin/chromium-browser
+ENV NODE_PATH /usr/local/share/.config/yarn/global/node_modules:$NODE_PATH
+
+COPY docker-entrypoint.sh /docker-entrypoint.sh
+
+WORKDIR /app
+
+RUN yarn global add [email protected].* [email protected].* && yarn cache clean
+
+ENTRYPOINT ["/bin/sh", "/docker-entrypoint.sh"]
+
+# COPY your files
+
+CMD ["node"]

docker-entrypoint.sh

@@ -0,0 +1,83 @@
+#!/usr/bin/env bash
+
+isCommand() {
+  for cmd in \
+    "access" \
+    "adduser" \
+    "audit" \
+    "bin" \
+    "bugs" \
+    "build" \
+    "bundle" \
+    "cache" \
+    "ci" \
+    "completion" \
+    "config" \
+    "dedupe" \
+    "deprecate" \
+    "dist-tag" \
+    "docs" \
+    "doctor" \
+    "edit" \
+    "explore" \
+    "help-search" \
+    "help" \
+    "hook" \
+    "init" \
+    "install-ci-test" \
+    "install-test" \
+    "install" \
+    "link" \
+    "logout" \
+    "ls" \
+    "npm" \
+    "org" \
+    "outdated" \
+    "owner" \
+    "pack" \
+    "ping" \
+    "prefix" \
+    "profile" \
+    "prune" \
+    "publish" \
+    "rebuild" \
+    "repo" \
+    "restart" \
+    "root" \
+    "run-script" \
+    "search" \
+    "shrinkwrap" \
+    "star" \
+    "stars" \
+    "start" \
+    "stop" \
+    "team" \
+    "test" \
+    "token" \
+    "uninstall" \
+    "unpublish" \
+    "update" \
+    "version" \
+    "view" \
+    "whoami"
+  do
+    if [ -z "${cmd#"$1"}" ]; then
+      return 0
+    fi
+  done
+
+  return 1
+}
+
+# check if the first argument passed in looks like a flag
+if [ "$(printf %c "$1")" = '-' ]; then
+  set -- /sbin/tini -- npm "$@"
+# check if the first argument passed in is composer
+elif [ "$1" = 'npm' ]; then
+  set -- /sbin/tini -- "$@"
+# check if the first argument passed in matches a known command
+elif isCommand "$1"; then
+  set -- /sbin/tini -- npm "$@"
+fi
+
+exec "$@"

src/Cluster.ts

@@ -128,12 +128,15 @@ export default class Cluster<JobData = any, ReturnData = any> extends EventEmitt
 
     private async init() {
         const browserOptions = this.options.puppeteerOptions;
+        if (process.env.CHROME_BIN) {
+            browserOptions.executablePath = process.env.CHROME_BIN;
+        }
         let puppeteer = this.options.puppeteer;
 
         if (this.options.puppeteer == null) { // check for null or undefined
             puppeteer = require('puppeteer');
         } else {
-            debug('Using provided (custom) puppteer object.');
+            debug('Using provided (custom) puppeteer object.');
         }
 
         if (this.options.concurrency === Cluster.CONCURRENCY_PAGE) {