libpq is not conditional

[natefoo]

I don't know if there is a way to do conditional deps in npm but the introduction of libpq as a dependency means that you have to have the libpq C library (and probably dev package) on your system just to install gx-it-proxy, even if you're not going to be using the postgres support:

npm ERR! code 1
npm ERR! path /home/g2test/node_modules/libpq
npm ERR! command failed
npm ERR! command sh -c -- node-gyp rebuild
npm ERR! gyp info it worked if it ends with ok
npm ERR! gyp info using [email protected]
npm ERR! gyp info using [email protected] | linux | x64
npm ERR! gyp info find Python using Python version 3.11.4 found at "/cvmfs/test.galaxyproject.org/venv/bin/python3"
npm ERR! gyp info spawn /cvmfs/test.galaxyproject.org/venv/bin/python3
npm ERR! gyp info spawn args [
npm ERR! gyp info spawn args   '/home/g2test/node_modules/node-gyp/gyp/gyp_main.py',
npm ERR! gyp info spawn args   'binding.gyp',
npm ERR! gyp info spawn args   '-f',
npm ERR! gyp info spawn args   'make',
npm ERR! gyp info spawn args   '-I',
npm ERR! gyp info spawn args   '/home/g2test/node_modules/libpq/build/config.gypi',
npm ERR! gyp info spawn args   '-I',
npm ERR! gyp info spawn args   '/home/g2test/node_modules/node-gyp/addon.gypi',
npm ERR! gyp info spawn args   '-I',
npm ERR! gyp info spawn args   '/home/g2test/.cache/node-gyp/18.12.1/include/node/common.gypi',
npm ERR! gyp info spawn args   '-Dlibrary=shared_library',
npm ERR! gyp info spawn args   '-Dvisibility=default',
npm ERR! gyp info spawn args   '-Dnode_root_dir=/home/g2test/.cache/node-gyp/18.12.1',
npm ERR! gyp info spawn args   '-Dnode_gyp_dir=/home/g2test/node_modules/node-gyp',
npm ERR! gyp info spawn args   '-Dnode_lib_file=/home/g2test/.cache/node-gyp/18.12.1/<(target_arch)/node.lib',
npm ERR! gyp info spawn args   '-Dmodule_root_dir=/home/g2test/node_modules/libpq',
npm ERR! gyp info spawn args   '-Dnode_engine=v8',
npm ERR! gyp info spawn args   '--depth=.',
npm ERR! gyp info spawn args   '--no-parallel',
npm ERR! gyp info spawn args   '--generator-output',
npm ERR! gyp info spawn args   'build',
npm ERR! gyp info spawn args   '-Goutput_dir=.'
npm ERR! gyp info spawn args ]
npm ERR! /usr/bin/which: no pg_config in (/home/g2test/node_modules/libpq/node_modules/.bin:/home/g2test/node_modules/node_modules/.bin:/home/g2test/node_modules/.bin:/home/node_modules/.bin:/node_modules/.bin:/cvmfs/test.galaxyproject.org/venv/lib/node_modules/npm/node_modules/@npmcli/run-script/lib/node-gyp-bin:/cvmfs/test.galaxyproject.org/venv/lib/node_modules/.bin:/cvmfs/test.galaxyproject.org/venv/bin:/cvmfs/test.galaxyproject.org/venv/bin:/home/g2test/.local/bin:/home/g2test/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin)
npm ERR! gyp: Call to 'which pg_config || find /usr/bin /usr/local/bin /usr/pg* /opt -executable -name pg_config -print -quit' returned exit status 0 while in binding.gyp. while trying to load binding.gyp
npm ERR! gyp ERR! configure error
npm ERR! gyp ERR! stack Error: `gyp` failed with exit code: 1
npm ERR! gyp ERR! stack     at ChildProcess.onCpExit (/home/g2test/node_modules/node-gyp/lib/configure.js:259:16)
npm ERR! gyp ERR! stack     at ChildProcess.emit (node:events:513:28)
npm ERR! gyp ERR! stack     at ChildProcess._handle.onexit (node:internal/child_process:291:12)
npm ERR! gyp ERR! System Linux 5.14.0-503.14.1.el9_5.x86_64
npm ERR! gyp ERR! command "/cvmfs/test.galaxyproject.org/venv/bin/node" "/home/g2test/node_modules/.bin/node-gyp" "rebuild"
npm ERR! gyp ERR! cwd /home/g2test/node_modules/libpq
npm ERR! gyp ERR! node -v v18.12.1
npm ERR! gyp ERR! node-gyp -v v8.4.1
npm ERR! gyp ERR! not ok