[exporter/file] Support setting permissions on opened files

[sinkingpoint]

Component(s)

exporter/file

Is your feature request related to a problem? Please describe.

Currently, all files opened by the file exporter are opened with 0600 (https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/pkg/stanza/operator/output/file/file.go#L80). This precludes anything except the user that the collector is running on from reading the files that it outputs. I want to be able to configure that, so that we can have more finely grained permissions.

Describe the solution you'd like

I want to add a configuration option to the file exporter to allow setting the permissions bits, and the user/group of the file that the file exporter makes. This configuration should be generic enough that it can be used in other file-like exporters (see: namedpipeexporter)

Describe alternatives you've considered

No response

Additional context

No response

[github-actions]

Pinging code owners:

• exporter/file: @atingchen

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[github-actions]

Pinging code owners for pkg/stanza: @djaglowski. See Adding Labels via Comments if you do not have permissions to add labels yourself.

[atingchen]

Hi,@sinkingpoin~I concur with the proposal to incorporate a configuration option into the file exporter for setting the permissions bits. Concurrently, I believe that the user/group associated with the file should be granted read-only permissions.
What you think?

[github-actions]

This issue has been inactive for 60 days. It will be closed in 60 days if there is no activity. To ping code owners by adding a component label, see Adding Labels via Comments, or if you are unsure of which component this issue relates to, please ping @open-telemetry/collector-contrib-triagers. If this issue is still relevant, please ping the code owners or leave a comment explaining why it is still relevant. Otherwise, please close it.

Pinging code owners:

• exporter/file: @atingchen

See Adding Labels via Comments if you do not have permissions to add labels yourself.