docs: describe how to access the cloned repository in a Docker in Docker approach

[kayman-mk]

Description

Using Docker-in-Docker gets complicated in case you want to access the cloned repository. You can't simply use . to mount it into the new container as you need to use the path from the Docker host and not from the container executing your pipeline.

I added a section with examples on how to do this easily.

Closes #532

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🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	1		0	0.0s
✅ COPYPASTE	jscpd	yes		no	1.59s
✅ JSON	eslint-plugin-jsonc	1	0	0	1.24s
✅ JSON	jsonlint	1		0	0.21s
✅ JSON	prettier	1	1	0	0.54s
✅ JSON	v8r	1		0	2.4s
✅ MARKDOWN	markdownlint	1	0	0	0.42s
✅ MARKDOWN	markdown-link-check	1		0	0.42s
✅ REPOSITORY	checkov	yes		no	16.63s
✅ REPOSITORY	dustilock	yes		no	0.46s
✅ REPOSITORY	gitleaks	yes		no	1.05s
✅ REPOSITORY	git_diff	yes		no	0.02s
✅ REPOSITORY	grype	yes		no	13.45s
✅ REPOSITORY	secretlint	yes		no	1.4s
✅ REPOSITORY	syft	yes		no	0.32s
✅ REPOSITORY	trivy-sbom	yes		no	1.43s
✅ REPOSITORY	trufflehog	yes		no	13.28s
✅ SPELL	cspell	9		0	2.7s
✅ TERRAFORM	terraform-fmt	5	0	0	0.24s
✅ YAML	prettier	1	0	0	0.48s
✅ YAML	v8r	1		0	2.72s
✅ YAML	yamllint	1		0	0.34s

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[github-actions]

This PR is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 15 days.

[github-actions]

This PR was closed because it has been stalled for 15 days with no activity.