infra: added pgadmin folder

solution/infrastructure/pgadmin/.env.template

@@ -0,0 +1,2 @@
+PGADMIN_DEFAULT_EMAIL=admin@mail.com
+PGADMIN_DEFAULT_PASSWORD_FILE=/run/secrets/pgadmin_password

solution/infrastructure/pgadmin/password

@@ -0,0 +1 @@
+admin

solution/infrastructure/pgadmin/servers.json

@@ -0,0 +1,18 @@
+{
+    "Servers": {
+        "1": {
+            "Name": "default",
+            "Group": "Servers",
+            "Host": "postgres",
+            "Port": 5432,
+            "MaintenanceDB": "postgres",
+            "Username": "postgres",
+            "KerberosAuthentication": false,
+            "ConnectionParameters": {
+                "sslmode": "prefer",
+                "connect_timeout": 10
+            },
+            "Tags": []
+        }
+    }
+}