add rsyncd config

docker/rsync/rsyncd.conf

@@ -0,0 +1,15 @@
+pid file = /var/run/rsyncd.pid
+lock file = /var/run/rsync.lock
+log file = /var/log/rsync.log
+# replace with user accessing the files
+
+[sponsorblock]
+use chroot = no
+max connections = 10
+# path to mirrored files
+path = /mirror
+comment = sponsorblock-database
+read only = true
+refuse options = c delete zl
+# disallow checksumming and compression level to reduce CPU/IO load
+# disallow deleting files clientside