chg: doc: [rocketchat] update doc to use =docker-tags-fetch=

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

rocketchat/README.org

@@ -30,52 +30,9 @@ from: https://hub.docker.com/r/rocketchat/rocket.chat
 Get the available tags:
 
 #+begin_src sh
-IMAGE_BASE_NAME=rocket.chat
-
-## lookup on docker hub only. Could think doing it for any docker
-## image identifier available on `pull`. This would mean querying
-## other registries, probably with a different api.
-docker:lookup_available_tags() {
-    local image="$1" limit="${2:-10}" filter="$3" eor p
-
-    ## remove any tags on image name
-    image="${image%%:*}"
-
-    if [[ "$image" == *"/"* ]]; then
-        username="${image%%/*}"
-        image="${image##*/}"
-    else
-        username="library"
-    fi
-
-    p=0
-    eor=
-    while [ -z "$eor" ]; do
-       ((p++))
-       out=$(curl -s "https://registry.hub.docker.com/v2/repositories/$username/$image/tags/?page=$p" |
-           jq -r '."results"[]["name"]') || break
-       [ -z "$out" ] && break
-       ## 10 results are expected per request, otherwise
-       ## this means we are hitting End of Records.
-       nb_result=$(printf "%s\n" "$out" | wc -l)
-       [ "$nb_result" -lt 10 ] && eor=true
-       ## filter records
-       [ "$filter" ] && out=$(printf "%s\n" "$out" | egrep "$filter")
-       [ -z "$out" ] && continue
-       nb_result=$(printf "%s\n" "$out" | wc -l)
-       if [ "$limit" -le "$nb_result" ]; then
-           printf "%s\n" "$out" | head -n "$limit"
-           break
-       fi
-       printf "%s\n" "$out"
-       limit=$((limit - nb_result))
-    done
-
-}
-
-docker:lookup_available_tags rocketchat/rocket.chat 15 "^[0-9]+(\.[0-9]+)*$"
-
+docker-tags-fetch rocket.chat -l 15 -f "^[0-9]+\.[0-9]+\.[0-9]+" | sort -V
 #+end_src
 
 Rocket.chat has a powerfull and working update database that will
-take care of migrating database on startup.
+take care of migrating database on startup.
+