cert-manager: add cert-manager for automatic certificate renewal

Add cert-manager with DNS-01 challenge support:
- Cloudflare (vhaudiquet.fr, buildpath.win)

kubernetes/system/cert-manager/cloudflare-api-token-secret.yaml

@@ -0,0 +1,47 @@
+# Cloudflare API Token for DNS-01 Challenges
+#
+# A Cloudflare API token with the following permissions:
+#   - Zone > DNS > Edit
+#   - Zone > Zone > Read
+#
+# Base64-encoded:
+#   echo -n "api-token" | base64
+#
+# This file will be SOPS-encrypted on pre-commit
+apiVersion: v1
+kind: Secret
+metadata:
+    name: cloudflare-api-token
+    namespace: cert-manager
+    labels:
+        app.kubernetes.io/name: cert-manager
+        app.kubernetes.io/component: cloudflare-api-token
+type: Opaque
+data:
+    api-token: ENC[AES256_GCM,data:Ty7PlsPTOUd1zjY5Z+YuKwQ9DbKuvZo8FPz4jdhQFbLGfSwkC8GkOE8LeqxxxdNCDm59luaoPmIVhmrog9SbZLjRw9Mfmh9E,iv:dSpHCC4E8JadygLfG3T3UObPic92fDLm1SDw/j9FxUA=,tag:9KoD5LNqR1WfXbv2upGwiw==,type:str]
+sops:
+    lastmodified: "2026-06-16T08:15:23Z"
+    mac: ENC[AES256_GCM,data:psnVaPRr7viLZPtR9CW0G8QJuO5fWHzlPs+iyuWPUSR3mqNadL9tZ5Waz90dlWpXrQnxXpna+mjTwKRYdIDiITEBMLE3dqMvDjPU4h74RhSO/HxgpU6GFQnm0V+yVh9qTnY6JAXM0lLelVvXLTi5mjQr6k/4+uoVUvQ8CvDOAnw=,iv:eJCaQGtzD67KRuMqWvNEWj+WN3YkyN6YEbWhrLM6Pv8=,tag:jrRSXYod7s5g/QoI3/i/xA==,type:str]
+    pgp:
+        - created_at: "2026-06-16T08:15:17Z"
+          enc: |-
+            -----BEGIN PGP MESSAGE-----
+
+            hQIMA7uy4qQr71wiAQ/+JlRMdXmo44Z0GBjsd4mfls2AHs9Jrcan674/rKx17Ixk
+            ucKBC+2GA9aLp3bGKB/7bExEgW9Wn0Ufa7Qf7KTjhr37Foz8FI4Nldq0v/GTQHTh
+            W/M/F+OtkBJDrcqN4cWIIfOTgkkTcgcChYaJYIpRinRzcTMCMC0EQQl6nZm3dFUw
+            6yPWEnbPRbEXVExq6tnU+zcGHazD9e03lUJiEWC1M7ot0sxpmzwrIFrIfJrfbQ9n
+            2fTlrYOKJk+M2XpiYojH8v6YCLKUTHCir1Nqfp2/xG/gT6zqfXODA2YRWxNQDMKr
+            39kinwny02F5tbTRxteni3rtgYEgkXUbvogYSbjNOYicEZ3PqmRuniF+L+6Bxxq2
+            3u5J3nhU1BncFjeWA1ZzyvfwenRRI+faO/nPRSuWe7Dt5c3+AodeFqIRAQNFZmor
+            WgiLTz6oOhvY9ieAp4nmcVRxl91luJzq1abtAvDLz4XN37uCqF0gwv1BAXCMW4NC
+            75IsfJU13Ctpccj5wQLuKMV2pQML1Q8MQluPr/dhqgAU3zFJVmGYtkvDemGEsMS/
+            xW6mgRPJXmClcoNhLYT9T0flSSrVRsAnGcMeoPhTePLxrrqZmEmZFNxo1+aSLnwJ
+            RP05RIZY//88R7MJidPkqqXekIQ9dmZb7M+43k9Re1nmi/CQs+ZxtnhGoz/DpZDS
+            XgGcVSS9GOEUcq7EOkxZZFHCR2VNGnpUyLPRtzsUJh0eAxOU3M5XLThFBk7yw8Co
+            ov0TDoVOo1cqCLkdiEOM2CNkXBTjlRdJg7pQMO1ytXzkoc1EFTTK6QMy7O0FL5U=
+            =xoE8
+            -----END PGP MESSAGE-----
+          fp: DC6910268E657FF70BA7EC289974494E76938DDC
+    encrypted_regex: ^(data|stringData|.*.key|.*.crt)$
+    version: 3.10.2