make /var/log readonly

Expect apps to redirect logs of stdout/stderr

Part of #503

setup/container/systemd/cloudron.target

@@ -2,8 +2,8 @@
 Description=Cloudron Smart Cloud
 Documentation=https://cloudron.io/documentation.html
 StopWhenUnneeded=true
-Requires=box.service docker_janitor.timer
-After=box.service docker_janitor.timer
+Requires=box.service
+After=box.service
 # AllowIsolate=yes
 
 [Install]

setup/container/systemd/docker_janitor.service

@@ -1,14 +0,0 @@
-[Unit]
-Description=Docker Volumes Janitor
-OnFailure=crashnotifier@%n.service
-
-[Service]
-Type=simple
-Restart=no
-ExecStart=/usr/sbin/docker_janitor
-KillMode=process
-User=root
-Group=root
-MemoryLimit=50M
-WatchdogSec=180
-

setup/container/systemd/docker_janitor.timer

@@ -1,10 +0,0 @@
-[Unit]
-Description=Docker Volumes Janitor
-StopWhenUnneeded=true
-
-[Timer]
-# this activates it immediately
-OnBootSec=0
-OnCalendar=*-*-* 0,6,12,18:00:00
-Unit=docker_janitor.service
-