Update docker.io/library/mariadb Docker tag to v12

resources/chaosknoten/public-reverse-proxy/nginx/acme_challenge.conf

@@ -79,6 +79,7 @@ map $host $upstream_acme_challenge_host {
     staging.cryptoparty-hamburg.de 172.31.17.151:31820;
     staging.cryptoparty.hamburg.ccc.de 172.31.17.151:31820;
     spaceapi.ccc.de spaceapiccc.hosts.hamburg.ccc.de:31820;
+    cpuccc.hamburg.ccc.de 172.31.17.151:31820;
     cpu.ccc.de 172.31.17.151:31820;
     lokal.ccc.de 172.31.17.151:31820;
     local.ccc.de 172.31.17.151:31820;

resources/chaosknoten/public-reverse-proxy/nginx/nginx.conf

@@ -97,6 +97,7 @@ stream {
         staging.cryptoparty-hamburg.de 172.31.17.151:8443;
         staging.cryptoparty.hamburg.ccc.de 172.31.17.151:8443;
         spaceapi.ccc.de spaceapiccc.hosts.hamburg.ccc.de:8443;
+        cpuccc.hamburg.ccc.de 172.31.17.151:8443;
         cpu.ccc.de 172.31.17.151:8443;
         lokal.ccc.de 172.31.17.151:8443;
         local.ccc.de 172.31.17.151:8443;