devcontainers: mount workspace in /PowerShell (#23857)

* devcontainers: mount workspace in /PowerShell

* Delete .devcontainer/fedora30 directory

fedora is not supported by PowerShell anymore

* Update Dockerfile

Update to a supported version of Ubuntu

---------

Co-authored-by: Travis Plunk <travis.plunk@microsoft.com>

.devcontainer/Dockerfile

@@ -3,13 +3,14 @@
 # Licensed under the MIT License. See https://go.microsoft.com/fwlink/?linkid=2090316 for license information.
 #-------------------------------------------------------------------------------------------------------------
 
-FROM mcr.microsoft.com/powershell/test-deps:ubuntu-18.04@sha256:20154a16708d4a92ebe81393361f27c7567e6553869e89dd6abdd198cc8ba309
+FROM mcr.microsoft.com/powershell/test-deps:ubuntu-20.04@sha256:d1609c57d2426b9cfffa3a3ab7bda5ebc4448700f8ba8ef377692c4a70e64b8c
 
 # Avoid warnings by switching to noninteractive
 ENV DEBIAN_FRONTEND=noninteractive
 
 # Configure apt and install packages
 RUN apt-get update \
+    && apt-get -y upgrade \
     && apt-get -y install --no-install-recommends apt-utils 2>&1 \
     #
     # Verify git, process tools, lsb-release (common in install instructions for CLIs) installed

.devcontainer/devcontainer.json

@@ -3,6 +3,9 @@
 	"name": ".NET Core 6.0, including pwsh (Ubuntu 18.04)",
 	"dockerFile": "Dockerfile",
 
+	"workspaceMount": "source=${localWorkspaceFolder},target=/PowerShell,type=bind",
+	"workspaceFolder": "/PowerShell",
+
 	// Uncomment the next line to run commands after the container is created.
 	"postCreateCommand": "cd src/powershell-unix && dotnet restore",
 

.devcontainer/fedora30/Dockerfile

@@ -1,10 +0,0 @@
-#-------------------------------------------------------------------------------------------------------------
-# Copyright (c) Microsoft Corporation.
-# Licensed under the MIT License. See https://go.microsoft.com/fwlink/?linkid=2090316 for license information.
-#-------------------------------------------------------------------------------------------------------------
-
-FROM mcr.microsoft.com/powershell:preview-fedora-30@sha256:f405d4d60f8d196532da75038c76c052084ef02121f8e2d3852080ff4a230a5a
-
-# Configure apt and install packages
-RUN dnf install -y git procps wget findutils \
-    && dnf clean all

.devcontainer/fedora30/devcontainer.json

@@ -1,16 +0,0 @@
-// See https://aka.ms/vscode-remote/devcontainer.json for format details.
-{
-	"name": "Fedora 30",
-	"dockerFile": "Dockerfile",
-
-	// Uncomment the next line to run commands after the container is created.
-	"postCreateCommand": "pwsh -c 'import-module ./build.psm1;start-psbootstrap'",
-
-	"extensions": [
-		"ms-azure-devops.azure-pipelines",
-		"ms-dotnettools.csharp",
-		"ms-vscode.powershell",
-		"DavidAnson.vscode-markdownlint",
-		"vitaliymaz.vscode-svg-previewer"
-	]
-}