feat: modernize platforms and cleanup legacy init templates #953

Job	Run time
lint-unit / runner / Cookstyle	17s
lint-unit / runner / yamllint	9s
lint-unit / runner / markdownlint	5s
lint-unit / runner / RSpec ubuntu-latest	41s
lint-unit / runner / linkspector	3m 25s
lint-unit / runner / actionlint	11s
lint-unit / runner / Check Metadata	8s
installation-script	0s
integration	0s
swarm	0s
final	0s
smoke	0s
	4m 56s

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