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

gitea/versions/28/gitea.env

@@ -0,0 +1,60 @@
+SSH_LISTEN_PORT=2222
+SSH_PORT=22
+GITEA_WORK_DIR=/data
+GITEA_TEMP=/tmp/gitea
+TMPDIR=/tmp/gitea
+GITEA_ADMIN_USERNAME={{ .adminUser }}
+GITEA_ADMIN_PASSWORD_MODE=keepUpdated
+
+# Core app settings
+GITEA____APP_NAME={{ .appName }}
+GITEA____RUN_MODE=prod
+GITEA____RUN_USER=git
+
+# Security settings
+GITEA__security__INSTALL_LOCK=true
+GITEA__security__PASSWORD_HASH_ALGO=pbkdf2
+
+# Database settings (except password which comes from secret)
+GITEA__database__DB_TYPE=postgres
+GITEA__database__HOST={{ .db.host }}:{{ .db.port }}
+GITEA__database__NAME={{ .db.name }}
+GITEA__database__USER={{ .db.user }}
+GITEA__database__SSL_MODE=disable
+GITEA__database__LOG_SQL=false
+
+# Server settings
+GITEA__server__DOMAIN={{ .domain }}
+GITEA__server__HTTP_PORT=3000
+GITEA__server__ROOT_URL=https://{{ .domain }}/
+GITEA__server__DISABLE_SSH=false
+GITEA__server__SSH_DOMAIN={{ .domain }}
+GITEA__server__SSH_PORT=22
+GITEA__server__SSH_LISTEN_PORT=2222
+GITEA__server__LFS_START_SERVER=true
+GITEA__server__OFFLINE_MODE=true
+
+# Service settings
+GITEA__service__REGISTER_EMAIL_CONFIRM=true
+GITEA__service__DISABLE_REGISTRATION=false
+GITEA__service__ALLOW_ONLY_EXTERNAL_REGISTRATION=false
+GITEA__service__ENABLE_NOTIFY_MAIL=true
+GITEA__service__ENABLE_BASIC_AUTHENTICATION=false
+GITEA__service__ENABLE_REVERSE_PROXY_AUTHENTICATION=false
+GITEA__service__ENABLE_CAPTCHA=false
+GITEA__service__REQUIRE_SIGNIN_VIEW=false
+GITEA__service__DEFAULT_KEEP_EMAIL_PRIVATE=false
+GITEA__service__DEFAULT_ALLOW_CREATE_ORGANIZATION=true
+GITEA__service__DEFAULT_ENABLE_TIMETRACKING=true
+GITEA__service__NO_REPLY_ADDRESS=noreply.localhost
+
+# Webhook settings
+GITEA__webhook__ALLOWED_HOST_LIST=*
+
+# Mailer settings (enabled via env vars, password from secret)
+GITEA__mailer__ENABLED=true
+GITEA__mailer__SMTP_ADDR={{ .smtp.host }}
+GITEA__mailer__SMTP_PORT={{ .smtp.port }}
+GITEA__mailer__FROM={{ .smtp.from }}
+GITEA__mailer__USER={{ .smtp.user }}
+