When novnc pod is re-run because of host reboot and so on,
novnc pod has existing volume /tmp/usr/share, which has 0444 permissions.
So init container occurs an error while it tries to copy asset files.
cp: cannot create regular file '/tmp/usr/share/novnc/index.html': Permission denied
With -f option, the init container can copy without errors.
Change-Id: I56d928b7f4a30a6be29b47560357a3b4f5eec764
Signed-off-by: hagun.kim <hagun.kim@samsung.com>