Update images

- replace shell script with pwsh
- add more tools from actions/virtual-environments
- fixup pwsh modules installation
- install node 12 and 16 in base
- add node 14 in js-*
- build rust images
- restrict flavours to amd64 only for now
- add helper scripts from actions/virtual-environments
- overhaul build and dockerfile

linux/ubuntu/scripts/helpers/os.sh

@@ -0,0 +1,17 @@
+#!/bin/bash -e
+################################################################################
+##  File:  install-helpers.sh
+##  Desc:  Helper functions for installing tools
+################################################################################
+
+function isUbuntu18() {
+  lsb_release -d | grep -q 'Ubuntu 18'
+}
+
+function isUbuntu20() {
+  lsb_release -d | grep -q 'Ubuntu 20'
+}
+
+function getOSVersionLabel() {
+  lsb_release -cs
+}