upd response_header_timeout_seconds to default 15s

[gertd]

Update response_header_timeout_seconds to 15s to handle ghcr.io recent increased latency spikes which are causing GitHub Action timeouts/failures pushing and pulling policy images

[coveralls]

Pull Request Test Coverage Report for Build 23428370681

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 7.31%

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Totals
Change from base Build 23427328613:	0.0%
Covered Lines:	733
Relevant Lines:	10027

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💛 - Coveralls