feat: Helm chart for MediaWiki 1.45

[Copilot]

Adds a new Helm chart deploying MediaWiki 1.45 on Kubernetes, following the same conventions as the existing filesender chart.

Chart highlights

• Image: mediawiki:1.45 (official Docker Hub)
• Database: Internal MariaDB 11.4 by default; external DB supported via mariadb.external.*
• Secrets: Admin password, DB passwords, $wgSecretKey, and $wgUpgradeKey are auto-generated on first install and stable across upgrades via lookup
• Config: LocalSettings.php rendered as a ConfigMap; sensitive values injected at runtime via getenv() — never embedded in plaintext config
• Persistence: Separate PVCs for MediaWiki uploads (10Gi) and MariaDB data (8Gi)
• Init container: busybox waits for DB readiness before starting MediaWiki
• Ingress: Optional, with TLS support

Structure

charts/mediawiki/
├── Chart.yaml              # appVersion: 1.45, version: 1.45.0
├── values.yaml
├── README.md               # FR docs with full config table
└── templates/
    ├── _helpers.tpl        # name/label/DB host helpers
    ├── configmap.yaml      # LocalSettings.php
    ├── secret.yaml         # auto-generated secrets
    ├── deployment.yaml     # MediaWiki pod + busybox init
    ├── service.yaml
    ├── ingress.yaml
    ├── pvc.yaml            # images upload volume
    ├── mariadb-deployment.yaml
    ├── mariadb-service.yaml
    ├── mariadb-pvc.yaml
    └── NOTES.txt           # post-install DB init instructions

DB init (first deploy)

The database schema must be initialized manually after first install — instructions are printed by helm status:

export MW_DB_PASS=$(kubectl get secret <release>-mediawiki -o jsonpath="{.data.mariadb-password}" | base64 -d)
export MW_ADMIN_PASS=$(kubectl get secret <release>-mediawiki -o jsonpath="{.data.mediawiki-admin-password}" | base64 -d)

kubectl exec -it deployment/<release>-mediawiki -- php /var/www/html/maintenance/install.php \
  --dbserver=<release>-mediawiki-mariadb --dbname=mediawiki --dbuser=mediawiki \
  --dbpass="${MW_DB_PASS}" --pass="${MW_ADMIN_PASS}" --scriptpath="" "Mon Wiki" "admin"

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Creation helmchart for Mediawiki</issue_title>
<issue_description>Crée un helmchart pour l'application Mediawiki en version 1.45</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Creation helmchart for Mediawiki #34

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[github-actions]

🏷️ Version RC publiée

Chart RC	3.6.2-rc.2
Version finale prévue	3.6.2
FileSender	3.6

Installation pour test

helm repo update ifpen
helm install filesender-rc ifpen/filesender --version 3.6.2-rc.2

Vérification

helm search repo ifpen/filesender --versions --devel

⚠️ Cette version RC sera remplacée par la version stable 3.6.2 lors du merge.

[velghea]

je ne veux pas que tu me fasses un update à filesender mais que tu installes dans le repo une autre application mediawiki en plus d efilesender