matrix/0x3c: increase postgres volume size before migration to matrix-ng

Change-Id: I80834986f9aeb629c3eb32c4e824290d9531c4ca
Reviewed-on: https://gerrit.hackerspace.pl/c/hscloud/+/1602
Reviewed-by: informatic <informatic@hackerspace.pl>

app/matrix/matrix.0x3c.pl.jsonnet

@@ -35,6 +35,17 @@ matrix {
         },
     },
 
+    postgres3+: {
+        cfg+:: {
+            storageSize: "200Gi"
+        },
+        volumeClaim+: {
+            metadata+: {
+                name: "waw3-postgres-2",
+            },
+        },
+    },
+
     appservices: {
         "telegram-prod": telegram.AppServiceTelegram("prod") {
             cfg+: {