new: [myc-install] will install ``docker-clean`` in cron.

It was removed from ``host`` charm, and need to be removable
if needed.

Signed-off-by: Valentin Lab <valentin.lab@kalysto.org>

README.org

@@ -40,12 +40,14 @@ mycéliandre. Un compose de base est aussi proposé.
 **** Hôte linux base debian 9
 
 #+BEGIN_SRC sh
+export WITHOUT_DOCKER_CLEAN=1  ## only if you want to remove docker clean from cron
 wget https://justodooit.myceliandre.fr/r/deploy -qO - | bash
 #+END_SRC
 
 If you want to setup odoo admin password and domain in one go:
 
 #+BEGIN_SRC sh
+export WITHOUT_DOCKER_CLEAN=1  ## only if you want to remove docker clean from cron
 export DOMAIN=myhost.com
 wget https://justodooit.myceliandre.fr/r/deploy -qO - | bash
 #+END_SRC

bin/myc-install

@@ -57,6 +57,10 @@ fi
 
 type -t docker-clean || ln -sfv /opt/apps/0k-docker/src/bin/docker-clean /usr/local/bin
 
+if [ -z "$WITHOUT_DOCKER_CLEAN" ]; then
+    ln -sfn /opt/apps/0k-docker/src/bin/docker-clean /etc/cron.daily/docker-clean
+fi
+
 ## To remove when image in odoo-tecnativa is not used anymore
 echo "Login into our server."
 docker login -u deploy -p deployinvm git.panda-chi.io:5002