Add permanently environmental variable to Ubuntu

I work with Ubuntu 18.04, and using softwares like: petalinux, Vivado. Each time i want to open vivado for example, I open terminal and type:

source /opt/XIlinx/Vivado/2020.2/settings64.sh

This is applied only to that specific terminal.

I understand that if I edit .profile file, I can make it redundant. So i add this line:

export PATH="$PATH:/opt/XIlinx/Vivado/2020.2/settings64.sh"

Log out, log in, but I still can't open vivado without sourcing settings64.sh file. What am I doing wrong?

this is the petalinux source file - settings.sh:

#
# Setup script for PetaLinux development environment.
#
# Copyright (c) 1995-2013 Xilinx, Inc.  All rights reserved.
#

SETTINGS_FILE='settings.sh'
# The right location will be replaced by the installer
XIL_SCRIPT_LOC="./"

if [ $# != 0 ]; then
    # The first argument is the location of PetaLinux Installation
    # Don't detect the installation location
    XIL_SCRIPT_LOC="$1"
else
    #  XIL_SCRIPT_LOC should point to script location
    if [ "$0" == "ksh" ]; then
        XIL_SCRIPT_LOC_TMP_UNI=`readlink -f ${XIL_ARG_}`
    else
        XIL_SCRIPT_LOC_TMP_UNI=$BASH_SOURCE
    fi
    XIL_SCRIPT_LOC_TMP_UNI=${XIL_SCRIPT_LOC_TMP_UNI%/*}
    if [ "$XIL_SCRIPT_LOC_TMP_UNI" != "" ]; then
        if [ "$XIL_SCRIPT_LOC_TMP_UNI" == "settings.sh" ]; then
            XIL_SCRIPT_LOC_TMP_UNI="./"
        fi
        XIL_SCRIPT_LOC_TMP_UNI=`readlink -f ${XIL_SCRIPT_LOC_TMP_UNI}`
        if [ $? == 0 ]; then
            XIL_SCRIPT_LOC=${XIL_SCRIPT_LOC_TMP_UNI}
        fi
    fi
    unset XIL_SCRIPT_LOC_TMP_UNI
fi

export PETALINUX=`readlink -f "${XIL_SCRIPT_LOC}"`

if echo "${PETALINUX}" | grep -q ' '; then
    echo "********************************************************"
    echo "WARNING: PetaLinux SDK installation path contains spaces"
    echo "WARNING: You are STRONGLY recommend to fix this".
    echo "********************************************************"
fi
export PETALINUX_VER=2020.2

export XSCT_TOOLCHAIN="${PETALINUX}/tools/xsct"

# Figure out host system architecture
# for now, only linux-i386 supported

#
# Add toolchains to user's search path
#
PATH="${XSCT_TOOLCHAIN}/gnu/aarch32/lin/gcc-arm-none-eabi/bin:${PATH}"
PATH="${XSCT_TOOLCHAIN}/gnu/aarch64/lin/aarch64-none/bin:${PATH}"
PATH="${XSCT_TOOLCHAIN}/gnu/armr5/lin/gcc-arm-none-eabi/bin:${PATH}"
PATH="${XSCT_TOOLCHAIN}/gnu/microblaze/lin/bin:${PATH}"

#
# Add required binary tools to the user's search path
#
PATH="${PETALINUX}/tools/xsct/petalinux/bin:${PETALINUX}/tools/common/petalinux/bin:${PATH}"

#
# Check for "." or ".\" in the path - it's broken
#
echo "${PATH}" | tr ":" "\n" | grep '^\./*$' > /dev/null && 
    echo "WARNING: '.' detected in PATH - fixing it." 1>&2
PATH=`echo ${PATH} | tr ":" "\n" | grep -v '^\./*$' | tr "\n" ":"`

# Strip any trailing or multi-colons - they are interpreted as '.'
PATH=$(echo ${PATH} | sed -e 's/:*$//g' -e 's/::*/:/g')

export PATH


echo PetaLinux environment set to \'${PETALINUX}\'

for s in /bin/sh sh; do
    if ! $s --version 2>/dev/null | grep -q "^GNU bash"; then
        echo "WARNING: $s is not bash! "
        echo "bash is PetaLinux recommended shell. Please set your default shell to bash."
        break
    fi
done

if ! echo $SHELL | grep -q "bash"; then
    echo "WARNING: $SHELL is not bash! "
    echo "/bin/bash is Petalinux recommended SHELL variable. Please set your SHELL variable to /bin/bash."
fi

"${PETALINUX}"/tools/common/petalinux//utils/petalinux-env-check