Register credentials extracted from proxy configuration as secrets #6988

Job	Run time
Packaging: Config file (macos-latest, linked)	1m 25s
Packaging: Config file (ubuntu-latest, default)	1m 18s
Packaging: Config file (ubuntu-latest, nightly-latest)	1m 30s
Packaging: Config file (windows-latest, default)	3m 35s
Packaging: Config file (macos-latest, nightly-latest)	1m 33s
Packaging: Config file (windows-latest, nightly-latest)	4m 3s
Packaging: Config file (ubuntu-latest, linked)	1m 13s
Packaging: Config file (macos-latest, default)	1m 25s
Packaging: Config file (windows-latest, linked)	4m 3s
	20m 5s

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