feat: add nix flake for dev env on nixos

.gitignore

@@ -84,3 +84,7 @@ s3-data/
 .ruff_cache/
 # S3
 data/
+
+# Nix
+result
+.direnv/

flake.nix

@@ -0,0 +1,98 @@
+{
+  description = "InvenioRDM development environment";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+      in
+      {
+        devShells.default = pkgs.mkShell {
+          name = "invenio-rdm";
+
+          packages = with pkgs; [
+            uv
+
+            nodejs_22
+            pnpm
+            corepack
+
+            gcc
+            gnumake
+            pkg-config
+            autoconf
+            automake
+            libtool
+
+            libxcrypt
+            libxml2
+            libxslt
+            xmlsec
+            cairo
+            openssl
+            zlib
+            libffi
+            readline
+            git
+          ];
+
+          shellHook = ''
+            # Add needed C libraries to path
+            export LD_LIBRARY_PATH="${pkgs.lib.makeLibraryPath [
+              pkgs.libxcrypt
+              pkgs.libxml2
+              pkgs.libxslt
+              pkgs.xmlsec
+              pkgs.cairo
+              pkgs.openssl
+              pkgs.zlib
+              pkgs.libffi
+              pkgs.readline
+              pkgs.stdenv.cc.cc.lib
+            ]}''${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}"
+
+            export LIBRARY_PATH="${pkgs.lib.makeLibraryPath [
+              pkgs.libxcrypt
+              pkgs.libxml2
+              pkgs.libxslt
+              pkgs.xmlsec
+              pkgs.cairo
+              pkgs.openssl
+              pkgs.zlib
+              pkgs.libffi
+              pkgs.readline
+              pkgs.stdenv.cc.cc.lib
+            ]}''${LIBRARY_PATH:+:$LIBRARY_PATH}"
+
+            export C_INCLUDE_PATH="${pkgs.lib.makeSearchPathOutput "dev" "include" [
+              pkgs.libxcrypt
+              pkgs.libxml2
+              pkgs.libxslt
+              pkgs.xmlsec
+              pkgs.cairo
+              pkgs.openssl
+              pkgs.zlib
+              pkgs.libffi
+              pkgs.readline
+            ]}''${C_INCLUDE_PATH:+:$C_INCLUDE_PATH}"
+
+            export PKG_CONFIG_PATH="${pkgs.lib.makeSearchPathOutput "dev" "lib/pkgconfig" [
+              pkgs.libxcrypt
+              pkgs.libxml2
+              pkgs.libxslt
+              pkgs.xmlsec
+              pkgs.cairo
+              pkgs.openssl
+              pkgs.zlib
+              pkgs.libffi
+            ]}''${PKG_CONFIG_PATH:+:$PKG_CONFIG_PATH}"
+          '';
+        };
+      }
+    );
+}