Bump remaining apps: major version slots and infrastructure

New version slots (major version jumps):
- gitea: 1.24.3 -> 28.2.0 (slot 1 -> 28)
- ghost: 5.130.6 -> 6.72.0 (slot 5 -> 6)
- formbricks: 3.6.0 -> 6.1.0 (slot 3 -> 6)
- mattermost: 10.8.1 -> 12.0.1 (slot 10 -> 12)
- zulip: 9.4 -> 12.3 (slot 9 -> 12)
- immich: 1.135.3 -> 3.3.5 (slot 1 -> 3)
- openproject: 16.1.1 -> 17.9.3 (slot 16 -> 17)
- listmonk: 5.0.3 -> 6.1.0 (slot 5 -> 6)
- discourse: 3.5.3 -> 2026.10.0 (slot 3 -> 2026, calver)

Same-slot large bumps:
- vllm: 0.9.2 -> 0.32.0
- longhorn: v1.8.1 -> v1.13.0

Infrastructure:
- cert-manager: v1.17.2 -> v1.21.2
- coredns: v1.12.0 -> v1.14.7
- externaldns: v0.13.4 -> v0.23.0
- metallb: v0.15.0 -> v0.16.1
- mysql: 9.1.0 -> 9.7.4
- node-feature-discovery: v0.17.3 -> v0.20.1
- nvidia-device-plugin: v0.17.1 -> v0.20.1

ghost/versions/6/db-init-job.yaml

@@ -0,0 +1,45 @@
+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: ghost-db-init
+  labels:
+    component: db-init
+spec:
+  template:
+    metadata:
+      labels:
+        component: db-init
+    spec:
+      containers:
+        - name: db-init
+          image: mysql:9.1.0
+          command: ["/bin/bash", "-c"]
+          args:
+            - |
+              mysql -h ${DB_HOSTNAME} -P ${DB_PORT} -u root -p${MYSQL_ROOT_PASSWORD} <<EOF
+              CREATE DATABASE IF NOT EXISTS ${DB_DATABASE_NAME};
+              CREATE USER IF NOT EXISTS '${DB_USERNAME}'@'%' IDENTIFIED BY '${DB_PASSWORD}';
+              ALTER USER '${DB_USERNAME}'@'%' IDENTIFIED BY '${DB_PASSWORD}';
+              GRANT ALL PRIVILEGES ON ${DB_DATABASE_NAME}.* TO '${DB_USERNAME}'@'%';
+              FLUSH PRIVILEGES;
+              EOF
+          env:
+            - name: MYSQL_ROOT_PASSWORD
+              valueFrom:
+                secretKeyRef:
+                  name: ghost-secrets
+                  key: mysql.rootPassword
+            - name: DB_HOSTNAME
+              value: "{{ .db.host }}"
+            - name: DB_PORT
+              value: "{{ .db.port }}"
+            - name: DB_DATABASE_NAME
+              value: "{{ .db.name }}"
+            - name: DB_USERNAME
+              value: "{{ .db.user }}"
+            - name: DB_PASSWORD
+              valueFrom:
+                secretKeyRef:
+                  name: ghost-secrets
+                  key: dbPassword
+      restartPolicy: OnFailure