Allows user to define BUILD_ variables

host_vars/all.yml.example

@@ -47,4 +47,4 @@ env_vars:
   #SPANDEX_SYNC_THRESHOLD: # Spandex and Datadog configuration setting.
   #BLOCK_COUNT_CACHE_PERIOD: 600 #Time to live of block count cache in milliseconds
   #ALLOWED_EVM_VERSIONS: "homestead, tangerineWhistle, spuriousDragon, byzantium, constantinople, petersburg" #	the comma-separated list of allowed EVM versions for contracts verification
-
+  #BUILD_* - redefine variables with BUILD_ prefix to override parameters used for building the dev server

roles/main_software/tasks/main.yml

@@ -115,6 +115,13 @@
     server_env: "{{ upper_env | combine({'NETWORK_PATH':'/','PORT':server_port}) }}"
   tags:
     - build
+    
+- name: Override build variables
+  set_fact:
+    server_env: "{{ server_env | combine({item.key|regex_replace('BUILD_'):item.value}) if item.key | search('BUILD_') else server_env  }}"
+  with_dict: "{{ server_env }}"
+  tags:
+    - build
 
 - name: Compile BlockScout
   command: "mix do {{ item }}"