migrate from raw flake to devenv

devenv.yaml

@@ -0,0 +1,20 @@
+# yaml-language-server: $schema=https://devenv.sh/devenv.schema.json
+inputs:
+  nixpkgs:
+    url: github:NixOS/nixpkgs/nixos-unstable
+  krew2nix:
+    url: github:a1994sc/krew2nix
+    inputs:
+      nixpkgs:
+        follows: nixpkgs
+
+# If you're using non-OSS software, you can set allowUnfree to true.
+# allowUnfree: true
+
+# If you're willing to use a package that's vulnerable
+# permittedInsecurePackages:
+#  - "openssl-1.1.1w"
+
+# If you have more than one devenv you can merge them
+#imports:
+# - ./backend