Multiple certificates

[sentry-io[bot]]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: downloadservice/app.py

Function	Unhandled Issue
list_dir	SSLError: HTTPSConnectionPool(host='dcache.cta.cscs.ch', port=2880): Max retries exceeded with url: /pnfs/c... ... Event Count: 5

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[volodymyrss]

I'll just merge it since I need another change.