feat: log client version on startup

[MegaRedHand]

This PR adds a log at startup that includes the client version. It also adds a parameter to the docker-build Makefile target to select the docker tag to use.

It also fixes an issue with the Dockerfile that caused version output to be ethlambda ethlambda/v0.1.0-VERGEN_IDEMPOTENT_OUTPUT-VERGEN_IDEMPOTENT_OUTPUT/aarch64-unknown-linux-gnu/rustc-v1.92.0.

[greptile-apps]

Greptile Overview

Greptile Summary

Adds an explicit startup log line that includes the full CLIENT_VERSION string, so operators can see the exact build (pkg version + git branch/SHA + target triple + rustc) immediately on launch.

This is consistent with existing usage of version::CLIENT_VERSION for the CLI --version flag and for node info metrics (set_node_info).

Confidence Score: 5/5

• This PR is safe to merge with minimal risk.
• The change is a single additional tracing::info! event emitted after the subscriber is installed; it uses an existing compile-time constant already relied upon for CLI versioning and metrics, and does not alter control flow or data handling.
• No files require special attention

Important Files Changed

Filename	Overview
bin/ethlambda/src/main.rs	Logs the client version at startup via a new tracing::info! event.

Sequence Diagram

sequenceDiagram
  participant User
  participant Main as bin/ethlambda/src/main.rs::main
  participant Tracing as tracing subscriber

  User->>Main: start `ethlambda`
  Main->>Tracing: set_global_default(subscriber)
  Main->>Main: CliOptions::parse()
  Main->>Main: print ASCII_ART
  Main->>Tracing: info!(version=CLIENT_VERSION, "Starting ethlambda")
  Main->>Tracing: info!("got node key")
  Main->>Main: initialize genesis/store/blockchain
  Main->>Main: spawn P2P task
  Main->>Main: start RPC server
  Main->>Tracing: info!("Node initialized")

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