scripts: Move nebula scripts into subdirectory

scripts/nebula/regen-all-host-certs.nix

@@ -0,0 +1,31 @@
+{ self', pkgs, ... }:
+pkgs.writeShellApplication {
+  name = "nebula-regen-all-host-certs";
+
+  runtimeInputs = [
+    pkgs.bitwarden-cli
+    pkgs.jq
+    self'.packages.nebula-regen-host-cert
+  ];
+
+  text = ''
+    hosts="$(nix eval .#nixosConfigurations --apply 'builtins.attrNames' --json | jq -r '.[]')"
+
+    if ! declare -px BW_SESSION >/dev/null 2>&1; then
+      BW_SESSION="$(bw unlock --raw || bw login --raw)"
+      export BW_SESSION
+    fi
+
+    ca_key="$(mktemp)"
+    chmod 600 "$ca_key"
+    trap 'rm -f "$ca_key"' EXIT
+    bw get notes 'nebula ca-key' > "$ca_key"
+
+    for host in $hosts; do
+      echo "Regenerating certificate for $host..."
+      nebula-regen-host-cert "$host" "$ca_key"
+    done
+
+    echo "Done!"
+  '';
+}