SSH needs this script to be executable

During the edxapp refactor, three tasks were combined, but the modes
were all squished to 0644

playbooks/roles/edxapp/tasks/deploy.yml

@@ -15,11 +15,11 @@
     dest: "{{ item.dest }}"
     owner: "{{ item.owner }}"  
     group: "{{ item.group }}"
-    mode: "0644"
+    mode: "{{ item.mode }}"
   with_items:
-    - { src: 'edxapp_env.j2', dest: '{{ edxapp_app_dir }}/edxapp_env', owner: '{{ edxapp_user }}', group: '{{ common_web_user }}' }
-    - { src: 'newrelic.ini.j2', dest: '{{ edxapp_app_dir }}/newrelic.ini', owner: '{{ edxapp_user }}', group: '{{ common_web_user }}' }
-    - { src: 'git_ssh.sh.j2', dest: '{{ edxapp_git_ssh }}', owner: '{{ edxapp_user }}', group: '{{ edxapp_user }}' }
+    - { src: 'edxapp_env.j2', dest: '{{ edxapp_app_dir }}/edxapp_env', owner: '{{ edxapp_user }}', group: '{{ common_web_user }}', mode: 0644 }
+    - { src: 'newrelic.ini.j2', dest: '{{ edxapp_app_dir }}/newrelic.ini', owner: '{{ edxapp_user }}', group: '{{ common_web_user }}', mode: 0644 }
+    - { src: 'git_ssh.sh.j2', dest: '{{ edxapp_git_ssh }}', owner: '{{ edxapp_user }}', group: '{{ edxapp_user }}', mode: 0750 }
   tags:
     - install
     - install:base