[IMP] runbot: allow to install Chrome from google

When choosing to install Chrome in a Dockerfile, the chrome version is
downloaded from Odoo nightly server. This make it difficult to test
with different versions of Chrome.

With this commit, we allow to install from Google in Docker files.

By default, the install remains from Odoo Nightly server but if the key
`custom_values['chrome_source']` is set to 'google' in a Dockerfile,
the specified version will be downloaded from Google servers when the
Docker image is built.

runbot/templates/dockerfile.xml

@@ -19,12 +19,21 @@ RUN set -x ; \
     <template id="runbot.docker_install_chrome">
       <t t-set="chrome_distrib" t-value="values['chrome_distrib']"/>
       <t t-set="chrome_version" t-value="values['chrome_version']"/>
+      <t t-set="chrome_source" t-value="values.get('chrome_source')"/>
 # Install Google Chrome
+      <t t-if="chrome_source == 'google'">
+RUN curl -sSL https://dl.google.com/linux/chrome/deb/pool/main/g/google-chrome-stable/google-chrome-stable_<t t-esc="chrome_version"/>_amd64.deb -o /tmp/chrome.deb \
+    &amp;&amp; apt-get update \
+    &amp;&amp; apt-get -y install --no-install-recommends /tmp/chrome.deb \
+    &amp;&amp; rm /tmp/chrome.deb
+      </t>
+      <t t-else="">
 RUN curl -sSL http://nightly.odoo.com/odoo.key | apt-key add - \
     &amp;&amp; echo "deb http://nightly.odoo.com/deb/<t t-esc="chrome_distrib"/> ./" > /etc/apt/sources.list.d/google-chrome.list \
     &amp;&amp; apt-get update \
     &amp;&amp; apt-get install -y -qq google-chrome-stable=<t t-esc="chrome_version"/> \
     &amp;&amp; rm -rf /var/lib/apt/lists/*
+      </t>
     </template>
 
     <template id="runbot.docker_install_phantomjs">