caddy-frontend: Put back certificates to input schemas

In "caddy-frontend: Implement KeDiFa SSL information" the certificates were
dropped from the schema, but still internally supported. This lead to missing
UI fields for still supported parameters.

Reintroduced them with OBSOLETE mark.

/reviewed-on !574

software/caddy-frontend/instance-caddy-input-schema.json

@@ -11,6 +11,18 @@
       "title": "Frontend Replication Quantity",
       "type": "integer"
     },
+    "apache-certificate": {
+      "description": "SSL Certificate used by the server. Deprecated, please use master-key-upload-url.",
+      "textarea": true,
+      "title": "[DEPRECATED] SSL Certificate",
+      "type": "string"
+    },
+    "apache-key": {
+      "description": "SSL Key used by the server. Deprecated, please use master-key-upload-url.",
+      "textarea": true,
+      "title": "[DEPRECATED] SSL Key",
+      "type": "string"
+    },
     "domain": {
       "description": "Base Domain for create subdomains (ie.: example.com).",
       "pattern": "^([a-zA-Z0-9]([a-zA-Z0-9\\-]{0,61}[a-zA-Z0-9])?\\.)+[a-zA-Z]{2,6}$",

software/caddy-frontend/instance-slave-caddy-input-schema.json

@@ -155,6 +155,20 @@
       "title": "Verify Backend Certificates",
       "type": "string"
     },
+    "ssl_crt": {
+      "default": "",
+      "description": "Content of the SSL Certificate file. Deprecated, please use key-upload-url.",
+      "textarea": true,
+      "title": "[DEPRECATED] SSL Certificate",
+      "type": "string"
+    },
+    "ssl_key": {
+      "default": "",
+      "description": "Content of the SSL Key file. Deprecated, please use key-upload-url.",
+      "textarea": true,
+      "title": "[DEPRECATED] SSL Key",
+      "type": "string"
+    },
     "ssl_proxy_ca_crt": {
       "default": "",
       "description": "Content of the SSL Certificate Authority file of the backend (to be used with ssl-proxy-verify)",