fix: build and ship basectl in the Docker image

[Pulsator01]

Summary

• build basectl in the Docker builder stage alongside base-reth-node and base-consensus
• copy basectl into the runtime image so it is available in the published container
• align the node image with the binaries already published upstream for the pinned Base release

[cb-heimdall]

✅ Heimdall Review Status

Requirement	Status	More Info
Reviews	✅ 1/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 1 Sum 2