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Add --certmode=gcp for using Google Cloud Certificate Manager's public CA instead of Let's Encrypt. GCP requires External Account Binding (EAB) credentials for ACME registration, so this adds --acme-eab-kid and --acme-eab-key flags. The EAB key accepts both base64url and standard base64 encoding to support both ACME spec format and gcloud output. Fixes tailscale/corp#34881 Signed-off-by: Raj Singh <raj@tailscale.com> Co-authored-by: Brad Fitzpatrick <bradfitz@tailscale.com>