gitlab-ci-local: remove unused dependencies (#397276)

pkgs/by-name/gi/gitlab-ci-local/package.nix

@@ -34,6 +34,29 @@ buildNpmPackage rec {
   '';
 
   postInstall = ''
+    NODE_MODULES=$out/lib/node_modules/gitlab-ci-local/node_modules
+
+    # Remove intermediate build files for re2 to reduce dependencies.
+    #
+    # This does not affect the behavior. On npm `re2` does not ship
+    # the build directory and downloads a prebuilt version of the
+    # `re2.node` binary. This method produces the same result.
+    find $NODE_MODULES/re2/build -type f ! -path "*/Release/re2.node" -delete
+    strip -x $NODE_MODULES/re2/build/Release/re2.node
+
+    # Remove files that depend on python3
+    #
+    # The node-gyp package is only used for building re2, so it is
+    # not needed at runtime. I did not remove the whole directory
+    # because of some dangling links to the node-gyp directory which
+    # is not required. It is possible to remove the directory and all
+    # the files that link to it, but I figured it was not worth
+    # tracking down the files.
+    #
+    # The re2/vendor directory is used for building the re2.node
+    # binary, so it is not needed at runtime.
+    rm -rf $NODE_MODULES/{node-gyp/gyp,re2/vendor}
+
     wrapProgram $out/bin/gitlab-ci-local \
       --prefix PATH : "${
         lib.makeBinPath [