fix: add base-consensus binary to geth and nethermind Dockerfiles

[Sertug17]

Fixes #1016

reth/Dockerfile already includes the base-consensus binary, but geth/Dockerfile and nethermind/Dockerfile were missing it entirely.

Operators using geth or nethermind with USE_BASE_CONSENSUS=true would get "Base client is not supported for this node type" error and fail to start — potentially missing the April 20th Base V1 Sepolia upgrade deadline.

Changes:

• Added Rust builder stage to both Dockerfiles
• Added base-consensus binary copy from builder
• Added base-consensus-entrypoint copy

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/1	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 0 Sum 1

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[Sertug17]

Bumping this the April 20th Base V1 Sepolia upgrade is in 2 days, and any operator running geth or nethermind with USE_BASE_CONSENSUS=true will hit the "Base client is not supported for this node type" error without this fix. The reth/Dockerfile already includes the base consensus builder stage, this PR just brings parity to the other two.

Happy to rebase or address feedback if anything needs adjusting.