feat: manage haproxy for stalwart (#420)

- add frontends for imap, imaps and smtp
- add backends for webadmin, imap, imaps and smtp

Reviewed-on: #420

site/profiles/manifests/stalwart/haproxy.pp

@@ -0,0 +1,59 @@
+# enable external access via haproxy
+class profiles::stalwart::haproxy (
+  Boolean $enable = false,
+){
+
+  # webadmin
+  profiles::haproxy::balancemember { "${facts['networking']['fqdn']}_443":
+    service => 'be_stalwart_webadmin',
+    ports   => [443],
+    options => [
+      "cookie ${facts['networking']['hostname']}",
+      'ssl',
+      'verify none',
+      'check',
+      'inter 2s',
+      'rise 3',
+      'fall 2',
+    ]
+  }
+
+  # imap
+  profiles::haproxy::balancemember { "${facts['networking']['fqdn']}_143":
+    service => 'be_stalwart_imap',
+    ports   => [143],
+    options => [
+      'check',
+      'inter 3s',
+      'rise 2',
+      'fall 3',
+    ]
+  }
+
+  # imaps
+  profiles::haproxy::balancemember { "${facts['networking']['fqdn']}_993":
+    service => 'be_stalwart_imaps',
+    ports   => [993],
+    options => [
+      'check',
+      'ssl',
+      'verify none',
+      'inter 3s',
+      'rise 2',
+      'fall 3',
+    ]
+  }
+
+  # smtp
+  profiles::haproxy::balancemember { "${facts['networking']['fqdn']}_25":
+    service => 'be_stalwart_smtp',
+    ports   => [25],
+    options => [
+      'check',
+      'inter 3s',
+      'rise 2',
+      'fall 3',
+    ]
+  }
+
+}