The build logs for the latest failed deployment show the prepare stage completed successfully and the full build plan was generated (Railpack 0.38.0, [email protected]), but the build then failed with: failed to solve: secret EMS_SENDER_TEL not found. The "context canceled" message on the apt line is a downstream symptom of that failure, not the root cause. Your service config has a variable named EMS_SENDER_TEL with a trailing space, which does not match the EMS_SENDER_TEL reference the builder resolves, so it is treated as missing. Removing the trailing space from that variable name in your service's variable settings should resolve the build failures.