fix(forgejo): update container's exposed ports

Only expose the forgejo container's SSH port if the SSH server is
enabled.

templates/compose/docker-compose.yaml.gotmpl

@@ -67,8 +67,12 @@ services:
     - tar.gz
     {{- end }}
     expose:
-    - "{{ .Forgejo.SshPort }}"
     - "{{ .Forgejo.HttpPort }}"
+    {{- if .Forgejo.StartSSHServer -}}
+    {{ print "" }}
+    - "{{ .Forgejo.SshPort }}"
+    {{- end -}}
+    {{ print "" }}
     networks:
       flow:
         ipv4_address: "{{ .Forgejo.ContainerIpv4Address }}"