fix some bugs, optimize some other things

common/files/keys/lars@aurora.pub

+ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEwG9nY4C3knP7ABJMsyqu9ij+tH+sL/ekGFlydugE5/ lars@aurora

common/handlers/main.yml

@@ -18,3 +18,6 @@
 
 - name: update initramfs
   command: update-initramfs -u
+
+- name: update timezone
+  command: dpkg-reconfigure --frontend noninteractive tzdata

common/tasks/filesystem.yml

@@ -2,7 +2,7 @@
 # file: roles/common/tasks/filesystem.yml
 
 - name: ensure /tmp is a tmpfs
-  mount: name=/tmp src=tmpfs fstype=tmpfs opts=nosuid,rw
+  mount: name=/tmp src=tmpfs fstype=tmpfs opts=nosuid,rw state=mounted
   tags:
     - config
     - mount

common/tasks/ntpd.yml

 ---
 # file: roles/common/tasks/ntp.yml
 
+- name: ensure correct timezone setting
+  copy: src=timezone dest=/etc/timezone owner=root group=root mode=0644
+  notify:
+    - update timezone
+  tags:
+    - config
+    - ntpd
+
 - name: ensure ntpd is installed
   apt:  name=ntp state=latest
   tags: