ci: add GitHub Actions workflows for linting

[eitsupi]

Close #47

TODO

• Configure clippy
• Add config files for linters (at least markdownlint, yamllint)
  • markdownlint should ignore cran-comments and CRAN-SUBMISSION
• Rbuildignore these files

[github-actions]

🦙 MegaLinter status: ❌ ERROR

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
❌ ACTION	actionlint	6		5	0.11s
✅ COPYPASTE	jscpd	yes		no	1.58s
✅ EDITORCONFIG	editorconfig-checker	82		0	0.15s
✅ JSON	eslint-plugin-jsonc	1	0	0	0.85s
✅ JSON	jsonlint	1		0	0.17s
✅ JSON	prettier	1	1	0	0.34s
✅ JSON	v8r	1		0	1.95s
⚠️ MARKDOWN	markdownlint	5	2	47	0.93s
✅ MARKDOWN	markdown-link-check	5		0	2.15s
✅ MARKDOWN	markdown-table-formatter	5	2	0	0.28s
❌ REPOSITORY	checkov	yes		5	10.82s
✅ REPOSITORY	gitleaks	yes		no	4.38s
✅ REPOSITORY	git_diff	yes		no	0.01s
✅ REPOSITORY	grype	yes		no	13.7s
✅ REPOSITORY	kics	yes		no	12.98s
✅ REPOSITORY	secretlint	yes		no	0.79s
❌ REPOSITORY	trivy	yes		1	3.65s
✅ REPOSITORY	trivy-sbom	yes		no	1.17s
✅ REPOSITORY	trufflehog	yes		no	5.69s
❌ RUST	clippy	yes		1	18.84s
❌ SPELL	lychee	16		2	0.68s
✅ YAML	prettier	10	0	0	0.84s
✅ YAML	v8r	10		0	8.35s
❌ YAML	yamllint	10		1	0.42s

See detailed report in MegaLinter reports

MegaLinter is graciously provided by