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/gh.sh

@@ -0,0 +1,12 @@
+#!/bin/bash -e
+################################################################################
+##  File:  github-cli.sh
+##  Desc:  Installs GitHub CLI
+##         Must be run as non-root user after homebrew
+################################################################################
+# source: https://github.com/actions/virtual-environments/blob/be27ebfdb31aece2c90fbe1984c1749cbd1b464c/images/linux/scripts/installers/github-cli.sh
+
+# Install GitHub CLI
+url=$(curl -s https://api.github.com/repos/cli/cli/releases/latest | jq -r ".assets[].browser_download_url|select(contains(\"linux\") and contains(\"$(arch)\") and contains(\".deb\"))")
+wget -q "$url" -O "/tmp/gh.deb"
+apt install /tmp/gh.deb