CI: check deployment inside containers for various combinations of OSs and platforms

GitHub Action to run almalinux-deploy.sh on:

OSs: oraclelinux:9, rockylinux:9, quay.io/centos/centos:stream9, redhat/ubi9:latest, virtuozzo/vzlinux9:latest, oraclelinux:8, rockylinux:8, quay.io/centos/centos:stream8, redhat/ubi8:latest, virtuozzo/vzlinux8:latest
platforms: linux/amd64, linux/ppc64le, linux/s390x, linux/arm64
force set that we are inside container, create /.dockerenv
use 'rockylinux/rockylinux:' instead of official 'rockylinux:' broken images
if CentOS Stream 8, switch into vault.centos.org
if Virtuozzo Linux, update vzlinux-release without GPG checking prior to system upgrade
if Virtuozzo Linux 8, do 'rm -f /var/lib/rpm/__db*' to fix error: "db5 error(-30969) from dbenv->open"
tests: docker platform matches machine type; the release string; installed GPG public KEY(s)
run the job manually or if pull request event
code clean up

Fixes: #220

AlmaLinux / almalinux-deploy