feat: make beacon API port configurable (#901)

Author: avilagaston9

config/config.exs

@@ -25,15 +25,6 @@ config :lambda_ethereum_consensus, LambdaEthereumConsensus.Telemetry, enable: tr
 # Use Jason for JSON parsing in Phoenix
 config :phoenix, :json_library, Jason
 
-# Configures the phoenix endpoint
-config :lambda_ethereum_consensus, BeaconApi.Endpoint,
-  http: [port: 4000],
-  url: [host: "localhost"],
-  render_errors: [
-    formats: [json: BeaconApi.ErrorJSON],
-    layout: false
-  ]
-
 # Load minimal config by default, to allow schema checking
 config :lambda_ethereum_consensus, ChainSpec,
   config: MinimalConfig,

config/runtime.exs

@@ -12,7 +12,9 @@ switches = [
   metrics: :boolean,
   metrics_port: :integer,
   validator_file: :string,
-  log_file: :string
+  log_file: :string,
+  beacon_api: :boolean,
+  beacon_api_port: :integer
 ]
 
 is_testing = Config.config_env() == :test
@@ -36,6 +38,8 @@ testnet_dir = Keyword.get(args, :testnet_dir)
 enable_metrics = Keyword.get(args, :metrics, false)
 metrics_port = Keyword.get(args, :metrics_port, if(enable_metrics, do: 9568, else: nil))
 validator_file = Keyword.get(args, :validator_file)
+enable_beacon_api = Keyword.get(args, :beacon_api, false)
+beacon_api_port = Keyword.get(args, :beacon_api_port, 4000)
 
 config :lambda_ethereum_consensus, LambdaEthereumConsensus.ForkChoice,
   checkpoint_sync_url: checkpoint_sync_url
@@ -110,6 +114,18 @@ config :lambda_ethereum_consensus, EngineApi,
   implementation: implementation,
   version: "2.0"
 
+# Beacon API
+alias BeaconApi
+
+config :lambda_ethereum_consensus, BeaconApi.Endpoint,
+  server: enable_beacon_api,
+  http: [port: beacon_api_port],
+  url: [host: "localhost"],
+  render_errors: [
+    formats: [json: BeaconApi.ErrorJSON],
+    layout: false
+  ]
+
 # Validator
 #
 # `validator_file` should be a file with two non-empty lines, the first being