jibri: simplify Dockerfile

Slightly reduce layer count by running everything in a single RUN.

Also reduce build time by skipping some unneeded apt update / cleanups.

jibri/rootfs/usr/bin/install-chrome.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+set -o pipefail -xeu
+
+if [ "${USE_CHROMIUM}" = 1 -o "${TARGETPLATFORM}" = "linux/arm64" ]; then
+    echo "Using Debian's Chromium"
+    apt-dpkg-wrap apt-get install -y chromium chromium-driver chromium-sandbox
+    chromium --version
+else
+    if  [ "${CHROME_RELEASE}" = "latest" ]; then
+        wget -qO - https://dl-ssl.google.com/linux/linux_signing_key.pub | gpg --dearmour > /etc/apt/trusted.gpg.d/google.gpg
+        echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" > /etc/apt/sources.list.d/google-chrome.list
+        apt-dpkg-wrap apt-get update
+        apt-dpkg-wrap apt-get install -y google-chrome-stable
+    else
+        curl -4so "/tmp/google-chrome-stable_${CHROME_RELEASE}-1_amd64.deb" "http://dl.google.com/linux/chrome/deb/pool/main/g/google-chrome-stable/google-chrome-stable_${CHROME_RELEASE}-1_amd64.deb"
+        apt-dpkg-wrap apt-get install -y "/tmp/google-chrome-stable_${CHROME_RELEASE}-1_amd64.deb"
+    fi
+
+    google-chrome --version
+
+    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
+fi
+
+chromedriver --version