Initial infra scaffold: watcher live on Infomaniak Public Cloud

- flake.nix exposes a devShell (openstackclient, opentofu, sops, age) plus
  nixosConfigurations.watcher (runtime) and packages.watcher-image (QCOW2
  via nixos-generators / openstack format).
- hosts/watcher/default.nix: SSH-only base, tyro user with key auth, root
  SSH disabled, trusted-users set so laptop closure pushes work.
- modules/website.nix: Caddy serves tyrolize.ch from sites/tyrolize.ch/;
  lize.ch 301-redirects; firewall opens 80/443. Let's Encrypt via HTTP-01.
- terraform/infomaniak/: OpenStack provider, security group (22/80/443),
  keypair, compute instance booted from the uploaded image. Auth via OS_*
  env vars sourced from terraform/infomaniak/.env by the devShell hook.
- scripts/build-image.sh + scripts/deploy.sh.
- dns/{tyrolize,lize}.ch.zone: full BIND zone files for the advanced view
  in Infomaniak DNS Manager; preserves kSuite mail records on lize.ch.

Watcher live at 195.15.203.200 (IPv6 2001:1600:10💯:b4e), NixOS 25.05.
HTTPS confirmed working on both domains.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

terraform/infomaniak/.env.example

@@ -0,0 +1,43 @@
+# Copy to `.env` (gitignored) and fill in real values from the clouds.yaml
+# you can download at: Infomaniak Manager → Public Cloud → your project →
+# API access → Download clouds.yaml.
+#
+# Once filled in, just run `nix develop` from the repo root — the devShell's
+# shellHook automatically sources this file. Then `openstack ...` and
+# `terraform ...` are authenticated.
+
+# --- OpenStack auth (application credential = modern, recommended) ---
+# In your downloaded clouds.yaml these live under:
+#   clouds.openstack.auth_type
+#   clouds.openstack.auth.auth_url
+#   clouds.openstack.auth.application_credential_id
+#   clouds.openstack.auth.application_credential_secret
+export OS_AUTH_TYPE=v3applicationcredential
+export OS_AUTH_URL=https://api.pub1.infomaniak.cloud/identity/v3
+export OS_APPLICATION_CREDENTIAL_ID=REPLACE_ME
+export OS_APPLICATION_CREDENTIAL_SECRET=REPLACE_ME
+
+export OS_REGION_NAME=dc3-a
+export OS_INTERFACE=public
+export OS_IDENTITY_API_VERSION=3
+
+# --- Alternative: legacy username + password auth ---
+# Only if your clouds.yaml uses passwords instead of an application credential.
+# Comment out the four OS_AUTH_TYPE / OS_AUTH_URL / OS_APPLICATION_* lines above
+# and uncomment these instead:
+#
+# export OS_AUTH_URL=https://api.pub1.infomaniak.cloud/identity/v3
+# export OS_PROJECT_ID=REPLACE_ME
+# export OS_PROJECT_NAME=REPLACE_ME
+# export OS_USER_DOMAIN_NAME=Default
+# export OS_USERNAME=REPLACE_ME
+# export OS_PASSWORD=REPLACE_ME
+
+# --- Terraform variables ---
+# Contents of ~/.ssh/id_ed25519.pub (one line, quoted).
+export TF_VAR_ssh_public_key="ssh-ed25519 AAAA... tyro@lize.ch"
+
+# Override defaults from variables.tf only if you want a different size/network:
+# export TF_VAR_flavor_name="a2-ram4-disk50-perf1"
+# export TF_VAR_external_network="ext-net1"
+# export TF_VAR_watcher_image_name="nixos-watcher"