playbook/edgepacer: add edgepacer playbook

playbook/edgepacer.yml

+- name: a play that runs entirely on the ansible host
+  hosts: 127.0.0.1
+  connection: local
+
+  roles:
+    - edgepacer

playbook/roles/edgepacer/files/configure-slapos.py

+#!/usr/bin/env python3
+import configparser
+import subprocess
+
+CONF_PATH = "/etc/opt/slapos/slapos.cfg"
+
+edgepacer_config = {
+    'networkcache': {
+        'download-from-binary-cache-force-url-list': '''
+https://lab.nexedi.com/nexedi/slapos/raw/1.
+https://lab.node.vifib.com/nexedi/slapos/raw/1.0.''',
+    },
+}
+
+with open('/opt/configure-slapos.log', 'w+') as l:
+
+    l.write("[configure-slapos] Configuring slapos...\n")
+
+    config = configparser.ConfigParser()
+    config.read(CONF_PATH)
+    config['networkcache'].update(edgepacer_config['networkcache'])
+    with open(CONF_PATH, 'w+') as f:
+        config.write(f)

playbook/roles/edgepacer/tasks/main.yml

+---
+
+  - name: Configure slapos
+    script: configure-slapos.py