feat(ubuntu): 添加旧版PowerShell安装脚本

添加用于在Ubuntu上安装旧版PowerShell(7.5.1)的bash脚本

Author: mudssky

linux/ubuntu/installer/install_pwsh_old.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+
+###################################
+# Prerequisites
+
+# Update the list of packages
+sudo apt-get update
+
+# Install pre-requisite packages.
+sudo apt-get install -y wget
+
+# Download the PowerShell package file
+wget https://github.com/PowerShell/PowerShell/releases/download/v7.5.1/powershell_7.5.1-1.deb_amd64.deb
+
+###################################
+# Install the PowerShell package
+sudo dpkg -i powershell_7.5.1-1.deb_amd64.deb
+
+# Resolve missing dependencies and finish the install (if necessary)
+sudo apt-get install -f
+
+# Delete the downloaded package file
+rm powershell_7.5.1-1.deb_amd64.deb
+
+# Start PowerShell Preview
+pwsh