CI creates folder for REST API docs

[tasso94]

Problem

• The REST API docs CI jobs only need to move a single file index.html via rsync.
• Usually, when more files are included in one folder, rsync copies the folder and the files.
• Since only a single file is synced, no folder is created, but the file is renamed from index.html to 7.20-SNAPSHOT or 7.20.
• This failed the job that syncs the stage content to prod since it tries to copy a directory where only a file exists.
  • Cf. https://ci.cambpm.camunda.cloud/view/Docs/job/docs/job/camunda-docs-release%20(rest-camunda-bpm-platform-7.20-SNAPSHOT)/4/console

Acceptance Criteria (Required on creation)

The CI creates the docs folder for the REST API documentation so that the rsync command detects the folder and copies the index.html file inside instead of renaming the file.

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Dev2QA handover

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[tasso94]

Note to reviewer: #3349 is just for testing and doesn't need to be reviewed. I'll close it after I merged the other branches.

[tasso94]

No backporting is needed.

[yanavasileva]

@tasso94, maybe ping Christian after you merge as he has open PRs related to the affected code for https://github.com/camunda/team-infrastructure/issues/383.