fix compose v3 syntax

defaults/main.yml

@@ -48,10 +48,16 @@ droneci_networks:
 droneci_networks_applied:
   - droneci
 
-# @var droneci_memory_limit: $ "_unset_"
-# @var droneci_memory_limit:example: $ "512m"
-# @var droneci_memory_reservation: $ "_unset_"
-# @var droneci_memory_reservation:example: $ "256m"
+# @var droneci_docker_resources: $ "_unset_"
+# @var droneci_docker_resources:example: >
+# droneci_docker_resources:
+#   limits:
+#     cpus: "0.50"
+#     memory: 50M
+#   reservations:
+#     cpus: "0.25"
+#     memory: 20M
+# @end
 
 droneci_db_type: sqlite
 droneci_db_server: localhost

templates/services/droneci_compose.yml.j2

@@ -62,11 +62,9 @@ services:
       {% endif %}
       - NO_PROXY={{ droneci_no_proxy | join(',') }}
       - no_proxy={{ droneci_no_proxy | join(',') }}
-    {% if droneci_memory_limit is defined %}
-    mem_limit: {{ droneci_memory_limit }}
-    {% endif %}
-    {% if droneci_memory_reservation is defined %}
-    mem_reservation: {{ droneci_memory_reservation }}
+    {% if droneci_docker_resources is defined %}
+    resources:
+      {{ droneci_docker_resources | to_nice_yaml | indent(6) }}
     {% endif %}
 
 {% if droneci_volumes | default([]) | rejectattr("bind") %}