Added new installer script 'python3'

Author: lukasz-zbrzeski

installers/python3/installer.sh

@@ -0,0 +1,25 @@
+#!/bin/sh
+
+YUM_CMD=$(which yum) # yum package manager for RHEL & CentOS
+DNF_CMD=$(which dnf) # dnf package manager for new RHEL & CentOS
+APT_GET_CMD=$(which apt-get) # apt package manager for Ubuntu & other Debian based distributions
+PACMAN_CMD=$(which pacman) # pacman package manager for ArchLinux
+APK_CMD=$(which apk) # apk package manager for Alpine
+
+ if [ ! -z $APT_GET_CMD ]; then
+    sudo apt-get update
+    sudo apt-get install python3
+ elif [ ! -z $DNF_CMD ]; then
+    sudo dnf install python3
+ elif [ ! -z $YUM_CMD ]; then
+    sudo yum install python3
+ elif [ ! -z $PACMAN_CMD ]; then
+    pacman -Sy python3
+ elif [ ! -z $APK_CMD ]; then
+    sudo apk add python3
+ else
+    echo "Couldn't install package"
+    exit 1;
+ fi
+
+python3 --version