Refactor shellcheck feature (#5) #17

Job	Run time
Lint / Lint shell scripts	15s
Test / Feature actionlint	1m 0s
Lint / Validate devcontainer-feature.json files	3s
Test / Feature postgresql-client	27s
Test / Feature actionlint » debian:latest	17s
Test / Feature shellcheck	1m 0s
Test / Feature actionlint » ubuntu:latest	29s
Test / Feature actionlint » mcr.microsoft.com/devcontainers/base:ubuntu	30s
Test / Feature postgresql-client » debian:latest	17s
Test / Feature postgresql-client » ubuntu:latest	18s
Test / Feature postgresql-client » mcr.microsoft.com/devcontainers/base:ubuntu	29s
Test / Feature shellcheck » debian:latest	26s
Test / Feature shellcheck » ubuntu:latest	35s
Test / Feature shellcheck » mcr.microsoft.com/devcontainers/base:ubuntu	30s
Publish to GitHub Packages	9s
	6m 45s

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