Add devcontainer configurations for source build (#14084)

* Add devcontainer configurations for source build

.devcontainer/devcontainer.json

@@ -0,0 +1,23 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.238.0/containers/dotnet
+{
+	"name": "Source-Build w/ Built Tarball",
+	"image": "mcr.microsoft.com/dotnet-buildtools/prereqs:fedora-33-20210222183538-031e7d2",
+	// A completely built .NET source-tarball is >64 GB
+	"hostRequirements": {
+		"storage": "128gb"
+	},
+	// Configure tool-specific properties.
+	"customizations": {
+		// Configure properties specific to VS Code.
+		"vscode": {
+			// Add the IDs of extensions you want installed when the container is created.
+			"extensions": [
+				"ms-dotnettools.csharp",
+				"eamodio.gitlens"
+			]
+		}
+	},
+	// Use 'onCreateCommand' to run pre-build commands inside the codespace.
+	"onCreateCommand": "${containerWorkspaceFolder}/.devcontainer/source-build-scripts/buildTarball.sh"
+}

.devcontainer/source-build-scripts/buildTarball.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+./.devcontainer/source-build-scripts/createTarball.sh
+
+cd $(realpath ..)/dotnet-source/
+
+./prep.sh
+./build.sh --online --clean-while-building || true

.devcontainer/source-build-scripts/createTarball.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+# Always return exit code 0 so that we can use the codespaces prebuild to diagnose build errors.
+./build.sh /p:ArcadeBuildTarball=true /p:TarballDir=$(realpath ..)/dotnet-source/ /p:PreserveTarballGitFolders=true || true
+
+# Save the commit hash of the currently built repo, so developers know which version was built
+git rev-parse HEAD > ./artifacts/prebuild.sha

.devcontainer/source-build-tarball/devcontainer.json

@@ -0,0 +1,20 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.238.0/containers/dotnet
+{
+	"name": "Source-Build w/ Tarball",
+	"image": "mcr.microsoft.com/dotnet-buildtools/prereqs:fedora-33-20210222183538-031e7d2",
+	// A completely built .NET source tarball is >64 GB
+	"hostRequirements": {
+		"storage": "128gb"
+	},
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"ms-dotnettools.csharp",
+				"eamodio.gitlens"
+			]
+		}
+	},
+	// Use 'onCreateCommand' to run pre-build commands inside the codespace.
+	"onCreateCommand": "${containerWorkspaceFolder}/.devcontainer/scripts/createTarball.sh"
+}

.devcontainer/source-build/devcontainer.json

@@ -0,0 +1,5 @@
+// Use this devcontainer if you don't need the full context of a source-build tarball
+{
+	"name": "Source-Build",
+	"image": "mcr.microsoft.com/dotnet-buildtools/prereqs:fedora-33-20210222183538-031e7d2"
+}