Revert "fix compose v3 syntax"

This reverts commit 347a10ebb1.

defaults/main.yml

@@ -11,16 +11,10 @@ droneci_runner_docker_service_directory: /var/lib/docker/services/droneci
 droneci_runner_docker_socket_path: /var/run/docker.sock
 droneci_runner_docker_service_stopped: False
 
-# @var droneci_runner_docker_resources: $ "_unset_"
-# @var droneci_runner_docker_resources:example: >
-# droneci_runner_docker_resources:
-#   limits:
-#     cpus: "0.50"
-#     memory: 50M
-#   reservations:
-#     cpus: "0.25"
-#     memory: 20M
-# @end
+# @var droneci_runner_docker_memory_limit:example: $ "512m"
+# @var droneci_runner_docker_memory_limit: $ "_unset_"
+# @var droneci_runner_docker_memory_reservation:example: $ "256m"
+# @var droneci_runner_docker_memory_reservation: $ "_unset_"
 
 # @var droneci_runner_docker_networks:example: >
 # droneci_runner_docker_networks:

templates/services/droneci_runner_compose.yml.j2

@@ -20,9 +20,11 @@ services:
       - DRONE_RPC_HOST={{ droneci_runner_docker_server }}
       - DRONE_RPC_SECRET={{ droneci_runner_docker_secret }}
       - DRONE_RUNNER_CAPACITY={{ droneci_runner_docker_capacity }}
-    {% if droneci_runner_docker_resources is defined %}
-    resources:
-      {{ droneci_runner_docker_resources | to_nice_yaml | indent(6) }}
+    {% if droneci_runner_docker_memory_limit is defined %}
+    mem_limit: {{ droneci_runner_docker_memory_limit }}
+    {% endif %}
+    {% if droneci_runner_docker_memory_reservation is defined %}
+    mem_reservation: {{ droneci_runner_docker_memory_reservation }}
     {% endif %}
 
 {% if droneci_runner_docker_networks | default([]) %}