Make role actually allow different memory configuration

WOW that took long enough

tasks/main.yml

@@ -18,6 +18,8 @@
       file: path={{ minecraft_home }}/{{ minecraft_name }} state=directory
     - name: accept eula
       template: src=eula.txt dest={{ minecraft_home }}/{{ minecraft_name }}/eula.txt
+    - name: template out env
+      template: src=env dest={{ minecraft_home }}/{{ minecraft_name }}/env
     - name: configure server properties
       lineinfile:
         dest: "{{ minecraft_home }}/{{ minecraft_name }}/server.properties"

templates/env

@@ -0,0 +1,2 @@
+JRE_XMX={{ minecraft_jre_xmx }}
+JRE_XMS={{ minecraft_jre_xms }}

templates/minecraft@.service

@@ -12,6 +12,7 @@ After=network.target
 User=minecraft
 Group=minecraft
 WorkingDirectory={{ minecraft_home }}/%i
+EnvironmentFile={{ minecraft_home }}/%i/env
 PrivateUsers=true
 ProtectSystem=full
 ProtectHome=true
@@ -22,7 +23,7 @@ ProtectKernelModules=true
 # Implies MountAPIVFS=yes
 ProtectControlGroups=true
 
-ExecStart=/bin/sh -c '/usr/bin/screen -DmS %i /usr/bin/java -Xms{{ minecraft_jre_xms }} -Xmx{{ minecraft_jre_xmx }} -jar server.jar nogui'
+ExecStart=/bin/sh -c '/usr/bin/screen -DmS %i /usr/bin/java -Xms${JRE_XMS} -Xmx${JRE_XMX} -jar server.jar nogui'
 
 ExecReload=/usr/bin/screen -p 0 -S %i -X eval 'stuff "reload"\\015'