Enable allow_email and add post install doc

doc/POST_INSTALL.md

@@ -0,0 +1,16 @@
+You have to configure SMTP from the web interface at https://__DOMAIN__/admin
+
+Visit Settings -> General and replace these values:
+
+- Root URL: https://__DOMAIN__
+- Default from email: listmonk <__APP__@__DOMAIN__>
+
+Visit Settings -> SMTP and replace with these values:
+
+- Host: 127.0.0.1
+- Port: 25
+- Auth protocol: PLAIN
+- User: __APP__
+- Password: __MAIL_PWD__
+
+Then, test the connection

manifest.toml

@@ -34,9 +34,6 @@ ram.runtime = "50M"
     type = "group"
     default = "visitors"
 
-    [install.admin]
-    type = "user"
-
 [resources]
 
     [resources.sources]
@@ -50,7 +47,13 @@ ram.runtime = "50M"
         arm64.sha256 = "832c5a34ed78446c179ed5423cdbce51d3e51333c1ea6cf11c74b63e0776193a"
         in_subdir = false
 
+        autoupdate.strategy = "latest_github_release"
+        autoupdate.asset.amd64 = ".*_linux_amd64.tar.gz"
+        autoupdate.asset.armhf = ".*_linux_armv7.tar.gz"
+        autoupdate.asset.arm64 = ".*_linux_arm64.tar.gz"
+
     [resources.system_user]
+    allow_email = true
 
     [resources.ports]
 
@@ -65,10 +68,11 @@ ram.runtime = "50M"
     admin.auth_header = false
     admin.allowed = "admins"
 
+    # internal API, should not be allowed to visitors
     api.url = "/api"
     api.show_tile = false
     api.auth_header = false
-    api.allowed = "visitors"
+    api.allowed = "admins"
 
     [resources.apt]
     packages = "postgresql"