add support for running inside vscode devcontainer #458

Job	Run time
Run tests on kas code (3.6)	5m 43s
Run tests on kas code (3.7)	4m 59s
Run tests on kas code (3.8)	4m 39s
Run tests on kas code (3.9)	4m 38s
Run tests on kas code (3.10)	4m 58s
Run tests on kas code (3.11)	4m 46s
Run tests on kas code (3.12)	4m 44s
Build, test and deploy container images (kas)	13m 12s
Build, test and deploy container images (kas-isar)	11m 39s
cleanup untagged kas containers	20s
cleanup untagged kas-isar containers	18s
	59m 56s

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