fix: replace whalesay with busybox

[tico24]

Closes #65

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	1		0	0.0s
✅ BASH	bash-exec	9		0	0.03s
✅ BASH	shellcheck	9		0	0.07s
✅ BASH	shfmt	9		0	0.02s
✅ COPYPASTE	jscpd	yes		no	1.0s
✅ JSON	jsonlint	12		0	0.17s
✅ JSON	prettier	9		0	0.55s
✅ JSON	v8r	12		0	4.62s
✅ MARKDOWN	markdownlint	45		0	0.77s
✅ MARKDOWN	markdown-link-check	45		0	6.6s
✅ MARKDOWN	markdown-table-formatter	45		0	0.29s
✅ REPOSITORY	gitleaks	yes		no	0.27s
✅ REPOSITORY	git_diff	yes		no	0.01s
✅ REPOSITORY	grype	yes		no	10.56s
✅ REPOSITORY	secretlint	yes		no	0.87s
✅ REPOSITORY	trivy-sbom	yes		no	0.1s
✅ REPOSITORY	trufflehog	yes		no	2.97s
✅ SPELL	cspell	93		0	2.95s
✅ YAML	prettier	24		0	0.9s
✅ YAML	v8r	23		0	6.11s
✅ YAML	yamllint	25		0	0.48s

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[Joibel]

A sniff test says it's fine.