Add Apache proxy and proxy-http modules

deploy/install.yml

@@ -71,6 +71,17 @@
          state: present
          name: rewrite
 
+     # The proxy and proxy-http modules are required to rewrite /.well-known/
+     # requests to the mail server if the file doesn't exist. This is use to
+     # renew Let's Encrypt certificates.
+     - apache2_module:
+         state: present
+         name: proxy
+
+     - apache2_module:
+         state: present
+         name: proxy-http
+
      - name: Install Postfix
        apt:
          pkg: