build: Fix Preview GitHub Action Workflow (re. pull_request_target)

[vorburger]

This should hopefully finally fix #42 (comment).

See https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#pull_request_target

[github-actions]

PR Preview Action v1.4.4
Preview removed because the pull request was closed.
2023-11-02 05:02 UTC

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	1		0	0.01s
✅ COPYPASTE	jscpd	yes		no	1.79s
✅ EDITORCONFIG	editorconfig-checker	1		0	0.01s
✅ REPOSITORY	checkov	yes		no	9.73s
✅ REPOSITORY	gitleaks	yes		no	0.16s
✅ REPOSITORY	git_diff	yes		no	0.01s
✅ REPOSITORY	grype	yes		no	11.22s
✅ REPOSITORY	secretlint	yes		no	0.83s
✅ REPOSITORY	trivy	yes		no	5.3s
✅ REPOSITORY	trivy-sbom	yes		no	5.06s
✅ REPOSITORY	trufflehog	yes		no	4.42s
✅ YAML	prettier	1	0	0	0.45s
✅ YAML	v8r	1		0	2.12s
✅ YAML	yamllint	1		0	1.53s

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