Add nebula devshell

flake-parts/nebula.nix

@@ -0,0 +1,19 @@
+_: {
+  perSystem =
+    { pkgs, ... }:
+    {
+      devShells.nebula = pkgs.mkShellNoCC {
+        packages = [
+          pkgs.nebula
+          pkgs.bitwarden-cli
+        ];
+
+        shellHook = ''
+          if ! declare -px BW_SESSION >/dev/null 2>&1; then
+            BW_SESSION="$(bw unlock --raw || bw login --raw)"
+            export BW_SESSION
+          fi
+        '';
+      };
+    };
+}