feat(forgejo): Git self-host en miroir de GitHub (git.funklab.online, SSO Authentik) (#96)

- k8s/apps/forgejo : deployment (image forgejo:11, config par env), service, PVC nfs,
  IngressRoute interne (git.lab.local) + publique (git.funklab.online + middlewares
  security-headers/ratelimit), Application ArgoCD (ns ai, recurse)
- base PostgreSQL `forgejo` sur storage-01 (rôle postgresql)
- vault : vault_pg_forgejo_password + vault_forgejo_oauth_client_secret
- doc admin/k8s/forgejo.md (archi, OIDC, création du miroir, pièges) + index + CLAUDE.md

GitHub reste la source de vérité (pull-mirror lecture seule) — ArgoCD inchangé.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

k8s/apps/forgejo/deployment.yaml

@@ -0,0 +1,99 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: forgejo
+  namespace: ai
+spec:
+  replicas: 1
+  strategy:
+    type: Recreate          # PVC RWO : pas de deux pods qui montent /data en parallèle
+  selector:
+    matchLabels:
+      app: forgejo
+  template:
+    metadata:
+      labels:
+        app: forgejo
+    spec:
+      containers:
+        - name: forgejo
+          image: codeberg.org/forgejo/forgejo:11
+          ports:
+            - containerPort: 3000
+              name: http
+          env:
+            # --- Base PostgreSQL sur storage-01 (hors cluster), pattern Ghostfolio/n8n ---
+            - name: FORGEJO__database__DB_TYPE
+              value: "postgres"
+            - name: FORGEJO__database__HOST
+              value: "192.168.10.1:5432"
+            - name: FORGEJO__database__NAME
+              value: "forgejo"
+            - name: FORGEJO__database__USER
+              value: "forgejo"
+            - name: FORGEJO__database__PASSWD
+              valueFrom:
+                secretKeyRef:
+                  name: forgejo-secret
+                  key: pg-password
+            # --- Serveur : URL canonique = domaine HTTPS (split-horizon dnsmasq en LAN) ---
+            - name: FORGEJO__server__DOMAIN
+              value: "git.funklab.online"
+            - name: FORGEJO__server__ROOT_URL
+              value: "https://git.funklab.online/"
+            - name: FORGEJO__server__HTTP_PORT
+              value: "3000"
+            # Pas de git-over-SSH : miroir + consultation en HTTPS uniquement (aucun
+            # port 22 supplémentaire exposé). Le clone/pull passe par HTTPS.
+            - name: FORGEJO__server__DISABLE_SSH
+              value: "true"
+            # --- Service : inscription fermée → connexion via SSO Authentik uniquement ---
+            - name: FORGEJO__service__DISABLE_REGISTRATION
+              value: "true"
+            # Autorise la création de compte au 1er login OIDC (source externe)
+            - name: FORGEJO__service__ALLOW_ONLY_EXTERNAL_REGISTRATION
+              value: "true"
+            - name: FORGEJO__service__ENABLE_BASIC_AUTHENTICATION
+              value: "true"     # clone HTTPS avec token perso
+            # --- Sécurité : install déjà verrouillée (config par env), clé stable ---
+            - name: FORGEJO__security__INSTALL_LOCK
+              value: "true"
+            - name: FORGEJO__security__SECRET_KEY
+              valueFrom:
+                secretKeyRef:
+                  name: forgejo-secret
+                  key: secret-key
+            - name: FORGEJO__migrations__ALLOWED_DOMAINS
+              value: "github.com"   # miroir : ne tire que depuis GitHub
+            - name: USER_UID
+              value: "1000"
+            - name: USER_GID
+              value: "1000"
+            - name: TZ
+              value: "Europe/Paris"
+          volumeMounts:
+            - name: data
+              mountPath: /data
+          resources:
+            requests:
+              cpu: 100m
+              memory: 256Mi
+            limits:
+              cpu: "1000m"
+              memory: 768Mi
+          readinessProbe:
+            httpGet:
+              path: /api/healthz
+              port: 3000
+            initialDelaySeconds: 20
+            periodSeconds: 15
+          livenessProbe:
+            httpGet:
+              path: /api/healthz
+              port: 3000
+            initialDelaySeconds: 60
+            periodSeconds: 30
+      volumes:
+        - name: data
+          persistentVolumeClaim:
+            claimName: forgejo-data