fix: [compose-core] prevent summoning each services in one go

Some requirement might solve other requests, especially the ones that
are not clear because more than one provider exist.

bin/compose-core

@@ -2636,6 +2636,7 @@ get_all_relations () {
         ## situation is stable
 
         if [ "${#summon[@]}" != 0 ]; then
+            declare -A summon_requeued=()
             while [ "${#summon[@]}" != 0 ]; do
                 service="${summon[0]}"
                 relation_name="${summon[1]}"
@@ -2650,10 +2651,19 @@ get_all_relations () {
                 fi
 
                 if [ "${#providers[@]}" -gt 1 ]; then
+                    if [ -z "${summon_requeued[$service/$relation_name]}" ]; then
+                        debug "Auto-summon ${DARKYELLOW}$service${NORMAL}" \
+                             "--${DARKBLUE}$relation_name${NORMAL}--> ($DARKYELLOW""${providers[@]}""$NORMAL)"\
+                             "(> 1 provider). Requeing."
+                        summon+=("$service" "$relation_name" "$relation_def")  ## re-queue it
+                        summon_requeued["$service/$relation_name"]=1
+                        continue
+                    else
                         warn "Auto-summon ${DARKYELLOW}$service${NORMAL}" \
                              "--${DARKBLUE}$relation_name${NORMAL}--> ($DARKYELLOW""${providers[@]}""$NORMAL)"\
                              "(> 1 provider). Choosing first."
                     fi
+                fi
                 ts="${providers[0]}"
 
                 ## YYYvlab: should be seen even in no debug mode no ?
@@ -2669,6 +2679,7 @@ get_all_relations () {
                 array_read-0 services_uses < <(_get_services_uses "$ts")
                 services[$ts]=1
                 changed=1
+                continue 2
             done
             continue
         fi