Add devcontainers.json and fix github actions for building wheels and running CI #29

Job	Run time
build-standalone-artifacts / generate-tier3	22s
build-standalone-artifacts / generate-tier1	13s
build-standalone-artifacts / generate-tier2	12s
build-standalone-artifacts / tier1 (style-gate-linux-amd64-jdk-latest, 7.68.9, ubuntu-latest, 3.8.12, mx sforceimports mx --dy...	1m 39s
build-standalone-artifacts / tier1 (tier1, ubuntu-latest, 3.12.8, 'pylint==2.4' 'astroid==2.4', true, utf-8, true)	48s
build-standalone-artifacts / tier2 (tier2, ubuntu-latest, 3.12.8, 'pylint==2.4' 'astroid==2.4', true, utf-8, true)	28s
build-standalone-artifacts / tier2 (python-svm-build-gate-linux-amd64-jdk-latest, 7.68.9, ubuntu-latest, 3.12.8, mx sforceimpo...	13m 43s
run-tests	-1s
	17m 24s

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