Fix logrotation rules

* explicitly specify the dirs that are getting rotated
* app log rules are now moved to logrotate.ejs
* we keep task logs for a week

Some testing notes:
* touch -d "10 days ago" foo
* logrotate /etc/logrotate.conf -v to test rotation. there is a state
file created in /var/lib/logrotate/status. If we have a 'daily' rule,
it will get processed only after a log line in status exists and it's atleast
1 day old timestamp.

https://github.com/logrotate/logrotate/blob/master/logrotate.c is quite
readable

src/logrotate.ejs

@@ -1,11 +1,23 @@
-# Generated by apptask for the /run mount
+# Generated by apptask
 
+# keep upto 7 rotated logs. rotation triggered daily or ahead of time if size is > 1M
 <%= volumePath %>/*.log <%= volumePath %>/*/*.log <%= volumePath %>/*/*/*.log {
-  rotate 7
-  daily
-  compress
-  maxsize=1M
-  missingok
-  delaycompress
-  copytruncate
+    rotate 7
+    daily
+    compress
+    maxsize 1M
+    missingok
+    delaycompress
+    copytruncate
 }
+
+/home/yellowtent/platformdata/logs/<%= appId %>/*.log {
+    # only keep one rotated file, we currently do not send that over the api
+    rotate 1
+    size 10M
+    missingok
+    # we never compress so we can simply tail the files
+    nocompress
+    copytruncate
+}
+