build container once, before running static-analysis

[github-actions]

groupware/.github/workflows/main.yaml

Lines 7 to 12 in e932822

	# TODO: build container once, before running static-analysis
	static-analysis:
	runs-on: ubuntu-latest
	defaults:
	run:
	shell: nix-shell --pure --run "bash -euxo pipefail {0}"

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This issue was generated by todo-issue based on a TODO comment in e932822. It's been assigned to @HellPat because they committed the code.