Add squid as a forwarding proxy so containers are exposed through a VPN

Implementation isn't perfect, but as `qbittorrent` already had an outbound VPN connection, it makes sense to just reuse it.

ansible/roles/http_proxy/tasks/main.yml

@@ -0,0 +1,18 @@
+- name: Install squid
+  package:
+    name: squid
+  become: true
+
+- name: Squid config
+  template:
+    src: files/squid.conf
+    dest: /etc/squid/squid.conf
+    mode: "0600"
+  become: true
+  notify: restart squid
+
+- name: Enable squid
+  service:
+    name: squid
+    enabled: true
+  become: true