jibri: correct chromedriver mismatch

* jibri: turn on -x so that we can see what is actually executing

* jibri: bail out on the build if the actual release doesn't match the major release

* jibri: ensure the correct chromedriver gets downloaded when CHROME_RELEASE != latest

* jibri: move chrome installation to a separate script

jibri/build/install-chrome.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+set -o pipefail -xeu
+
+if  [ "${CHROME_RELEASE}" = "latest" ]; then
+    wget -qO - https://dl-ssl.google.com/linux/linux_signing_key.pub | gpg --dearmour > /etc/apt/trusted.gpg.d/google.gpg
+    echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" > /etc/apt/sources.list.d/google-chrome.list
+    apt-dpkg-wrap apt-get update
+    apt-dpkg-wrap apt-get install -y google-chrome-stable
+    apt-cleanup
+else
+    curl -4so "/tmp/google-chrome-stable_${CHROME_RELEASE}-1_amd64.deb" "http://dl.google.com/linux/chrome/deb/pool/main/g/google-chrome-stable/google-chrome-stable_${CHROME_RELEASE}-1_amd64.deb"
+    apt-dpkg-wrap apt-get update
+    apt-dpkg-wrap apt-get install -y "/tmp/google-chrome-stable_${CHROME_RELEASE}-1_amd64.deb"
+    apt-cleanup
+fi
+
+if [ "${CHROMEDRIVER_MAJOR_RELEASE}" = "latest" ]; then
+    CHROMEDRIVER_RELEASE="$(curl -4Ls https://chromedriver.storage.googleapis.com/LATEST_RELEASE)"
+else
+    CHROMEDRIVER_RELEASE="$(curl -4Ls https://chromedriver.storage.googleapis.com/LATEST_RELEASE_${CHROMEDRIVER_MAJOR_RELEASE})"
+fi
+
+curl -4Ls "https://chromedriver.storage.googleapis.com/${CHROMEDRIVER_RELEASE}/chromedriver_linux64.zip"  | zcat >> /usr/bin/chromedriver
+chmod +x /usr/bin/chromedriver
+chromedriver --version