Pull images in installer.sh

This way if the network is not working, then the update will just
fail and use the old version

This also tags the addon images with the semver properly

scripts/installer.sh

@@ -81,6 +81,15 @@ if [[ ${try} -eq 10 ]]; then
     exit 4
 fi
 
+echo "==> installer: downloading new addon images"
+images=$(node -e "var i = require('${box_src_tmp_dir}/src/infra_version.js'); console.log(i.baseImages.join(' '), Object.keys(i.images).map(function (x) { return i.images[x].tag; }).join(' '));")
+
+echo -e "\tPulling docker images: ${images}"
+for image in ${images}; do
+    docker pull "${image}"           # this pulls the image using the sha256
+    docker pull "${image%@sha256:*}" # this will tag the image for readability
+done
+
 echo "==> installer: update cloudron-syslog"
 CLOUDRON_SYSLOG_DIR=/usr/local/cloudron-syslog
 CLOUDRON_SYSLOG="${CLOUDRON_SYSLOG_DIR}/bin/cloudron-syslog"