pkgs/build-support/php/builders/v2: copy installer-paths to the output (#375311)

    mkdir -p $out

    cp -ar composer.json $(composer config vendor-dir) $out/

    mapfile -t installer_paths < <(jq -r 'try((.extra."installer-paths") | keys[])' composer.json)

    for installer_path in "${installer_paths[@]}"; do

        # Remove everything after {$name} placeholder

        installer_path="${installer_path/\{\$name\}*/}";

        out_installer_path="$out/${installer_path/\{\$name\}*/}";

        # Copy the installer path if it exists

        if [[ -d "$installer_path" ]]; then

            mkdir -p $(dirname "$out_installer_path")

            cp -ar "$installer_path" "$out_installer_path"

            # Strip out the git repositories

            find $out_installer_path -name .git -type d -prune -print -exec rm -rf {} ";"

        fi

    done

    if [[ -f "composer.lock" ]]; then

        cp -ar composer.lock $(composer config vendor-dir) $out/

        cp -ar composer.lock $out/

    fi

    echo "Finished composerVendorInstallHook"