Setup APIM server and Run it with it's depending servers, Will only be useful until API manager product properly pack the dependencies in to final product. Till we get there ...

dev_mode.sh

#! /usr/bin/env bash
# HOW TO USE: Put this file inside the directory where you would like to extract and run the product-APIM build file (.zip file)
# Change the below path variables accordingly *** NOTE: No trailing `/` slashes has been used
# This will only work with APIM 3.0.0 latest version with Carbon 4.x kernel. Addition to coping and unziping the pack,
# This script will only create symbolic links to the carbon-apimgt repository files.
source_path="/Users/tmkasun/Documents/wso2/dev/products/apim/carbon-apimgt-forked/features/apimgt"
product_apimgt_path="/Users/tmkasun/Documents/wso2/dev/products/apim/product-apim-forked"
pack_name="wso2am-3.0.0-SNAPSHOT"

action=$1


create_symlink() {
    sources=$1
	destination=$2
	mv $destination "${destination}_back"
    echo "Linking " "${sources}" " ==========> " "${destination}"
    # mkdir -p `pwd`"/${destination}"
    #sudo mount --bind "${sources}" `pwd`"/${destination}"
    ln -s "${sources}" "${destination}"
}

symlink_apps() {
    artifact_id=$1
    dir_name=$2
    alt_dir_name=$3
    source="${source_path}/${artifact_id}/src/main/resources/${dir_name}"
    if [ $alt_dir_name ]
        then
            echo "Mapping $dir_name in source to $alt_dir_name in pack . . ."
            dir_name=$alt_dir_name
    fi
    create_symlink "${source}" "${pack_name}/repository/deployment/server/jaggeryapps/${dir_name}"

}

run() {
    echo "Running the setup ..."

    echo "Starting APIM ..."
    ./${pack_name}/bin/wso2server.sh
}

checkExitCode() {
    exit_code=$?; if [[ $exit_code != 0 ]]; then exit $exit_code; fi
}

setup() {
    echo "Setting-up the environment ..."
    echo "coping ${pack_name}zip from product apimgt build path to here ..."
    cp "${product_apimgt_path}/modules/distribution/product/target/${pack_name}.zip" .
    checkExitCode

    echo "Removing existing  $pack_name"
    rm -R ${pack_name}

    echo "Unziping $pack_name"
    code=$(unzip "${pack_name}.zip")
    checkExitCode

    echo "Creating symlinks for Publisher ..."
    symlink_apps "org.wso2.carbon.apimgt.publisher.feature" "publisher"
    checkExitCode

    echo "Creating symlinks for Store ..."
    symlink_apps "org.wso2.carbon.apimgt.store.feature" "devportal"
    checkExitCode

    run
}


if [ "$action" == "setup" ]; then
   setup
elif [ "$action" == "run" ]; then
   run
else
   echo "Unknown parameter. Type either 'setup' or 'run'"
fi

exit 1

Thank you @bhathiya 😊
I have added that change to the gist 👍