Revert "Switch to Chrome for Testing and drop support for Chromium (#824)" (#826)

This reverts commit bdfcc8a.

Broke the test build

Author: tgxworld

image/discourse_test/Dockerfile

@@ -17,7 +17,9 @@ RUN chown -R discourse . &&\
 
 FROM base AS with_browsers
 
-RUN npx @puppeteer/browsers install chrome@stable &&\
+ENV TESTEM_DEFAULT_BROWSER Chromium
+ADD install-chrome /tmp/install-chrome
+RUN /tmp/install-chrome &&\
     apt update &&\
     apt install -y libgconf-2-4 libxss1 firefox-esr &&\
     cd /tmp && wget -q "https://download.mozilla.org/?product=firefox-latest-ssl&os=linux64&lang=en-US" -O firefox.tar.bz2 &&\

image/discourse_test/install-chrome

@@ -0,0 +1,14 @@
+#!/bin/bash
+set -e
+
+# https://googlechromelabs.github.io/chrome-for-testing/ doesn't provide
+# linux/arm64 binaries for chrome or chromedriver yet. Therefore on arm64, we
+# install chromium instead of chrome.
+if [ "$(dpkg --print-architecture)" = "arm64" ]; then
+  apt update && apt install -y chromium-driver
+else
+  wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | sudo apt-key add - &&\
+    echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list &&\
+    apt update &&\
+    apt install -y google-chrome-stable chromium-driver
+fi