remount: Do not remount SquashFS volumes

SquashFS volumes, naturally, cannot be remounted read-write.

remount.yml

@@ -11,6 +11,8 @@
     - /
     - /usr
     - /opt
+    no_remount_fstype:
+    - squashfs
   tasks:
   - name: remount filesystems
     command:
@@ -20,6 +22,7 @@
       {{
       ansible_mounts
          | selectattr('mount', 'in', remount_fs)
+         | rejectattr('fstype', 'in', no_remount_fstype)
          | list
       }}
     when: not item.options.startswith(remount_state)