fix(entrypoint): upstream tag image has been updated

https://github.com/docker-library/httpd/commit/ea20f356a6f7d5b22793d0a51d82d6fccd08a6aa



it removes build dependencies but we were using bash transitively and it fails
add bash

good news: the image is A LOT smaller !

Change-Id: I3f267521360ee0214bc0196561bd0c7ba164eacc
Signed-off-by: Florent Benoit <fbenoit@redhat.com>