Ensure directories are writable when generating reports from read-only sources

[FSchumacher]

Description

When copying files while generating reports, make newly created directories writeable.

Motivation and Context

As reported in #6357 some distributions of JMeter provide the template directories read-only, only. As that is probably a good idea, we should support those kind of setups.

How Has This Been Tested?

Made some directories in ./bin/report-templates read-only and generated a report. With the current released version of JMeter we will get an exception as described in #6357. With the fix, the report is generated without problems.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• [x] My code follows the code style of this project.
• [x] I have updated the documentation accordingly.

[vlsi]

Could we make the folders read-only in CI?

[FSchumacher]

Could we make the folders read-only in CI?

I added a test case, but I am sure, that you could make that a bit nicer than me :)

[FSchumacher]

Has been merged into master