Improve service syntax related docs and tests nits

[6543]

collection of refactorings and improvements from #5988 but unrelated to it's change

• docs: fix environment syntax in services
• test: extend test for services schema
• test: make TestLintErrors more resilient
• refactor: move types.ContainerList into own file
• test: extend ReSerialize test from

[woodpecker-bot]

Surge PR preview deployment was removed

[qwerty287]

How is this related to the config services?

[6543]

well title is bad ... its about the syntax in the woodpecker config that relates to service but not the service stuff itself just code,tetsts,docs around it

it does not change how it works just add more test coverage and fix some docu nits