Install apt key and source for repository in deb postinst

Part of #2973

resources/linux/debian/postinst.template

@@ -33,6 +33,29 @@ if [ "@@NAME@@" != "code-oss" ]; then
 	APT_SOURCE_PARTS=$APT_ETC/$(get_apt_config_value Dir::Etc::sourceparts)
 	CODE_SOURCE_LIST=$APT_SOURCE_PARTS/vscode.list
 
+	# Sourced from https://packages.microsoft.com/keys/microsoft.asc
+	echo "-----BEGIN PGP PUBLIC KEY BLOCK-----
+Version: GnuPG v1.4.7 (GNU/Linux)
+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+=J6gs
+-----END PGP PUBLIC KEY BLOCK-----
+" | gpg --dearmor > microsoft.gpg
+	mv microsoft.gpg /etc/apt/trusted.gpg.d/microsoft.gpg
+
 	rm -f $CODE_SOURCE_LIST
-	# echo "deb [arch=amd64] https://packages.microsoft.com/repos/vscode stable main" > $CODE_SOURCE_LIST
+	echo "deb [arch=amd64] https://packages.microsoft.com/repos/vscode stable main" > $CODE_SOURCE_LIST
 fi
\ No newline at end of file