install docker buildx-plugin on runner

feat(packages): added install of tzdata and zip packages

chore: prune volumes in loop

Merge pull request #1 from DerStimmler/chore/use-lf-lineendings

chore: always use lf line endings for shell script

chore: update to latest runner config

feat: add powershell

add unzip library

prune docker images to reduce container size

fix: test for existence of cached images

chore: increase docker request timeout

chore: wait for docker to start agent

chore: alwys cleanup on start

chore: initial commit