Fixes two bugs in the auto-merge workflow PEM handling:
- echo may add trailing newline corrupting PEM content; use printf %s
- -binary flag in openssl dgst is unnecessary and removed
QA approved by privilegedescalation-qa (2026-04-21T20:24:46Z)
CTO approved by privilegedescalation-cto (2026-04-21T20:37:22Z)
Fixes PRI-173. Resolves PRI-179.
Co-Authored-By: Paperclip <noreply@paperclip.ing>