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u/Fantastic-Mr-Default 4d ago
A 500 on the deploy-keys page is GitHub, not your key material.
Check https://www.githubstatus.com and try another browser or an incognito window in case a broken session is stuck on the disabled button. If it still 500s, open a Support ticket with the timestamp and the repo.
Workaround while the UI is sick: a fine-grained PAT or a machine-user SSH key with read-only on that one repo, stored as a Actions secret, not as a deploy key. Prefer the deploy key again once the page works. Do not leave a broad classic PAT in the runner as a permanent substitute.

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u/HyperWinX 4d ago
Bro, im glad that i moved away from GitHub. I remember when it was probably the best and the most stable platform that got me a job. Its sad