Fix version population during prod build

omnibus/config/software/firezone.rb

@@ -23,6 +23,7 @@ dependency "postgresql"
 dependency "nodejs"
 dependency "elixir"
 dependency "nftables" if linux?
+dependency "ruby"
 
 version("1.0.0") do
   source path: File.expand_path("../", Omnibus::Config.project_root),
@@ -43,7 +44,10 @@ license :project_license
 skip_transitive_dependency_licensing true
 
 build do
-  env = with_standard_compiler_flags(with_embedded_path).merge("MIX_ENV" => "prod")
+  env = with_standard_compiler_flags(with_embedded_path).merge(
+    "MIX_ENV" => "prod",
+    "VERSION" => Omnibus::BuildVersion.semver
+  )
 
   command "mix local.hex --force", env: env
   command "mix local.rebar --force", env: env

scripts/semver.sh

@@ -2,9 +2,11 @@
 # frozen_string_literal: true
 
 begin
+  # Development
   require "omnibus"
 rescue LoadError
-  print "0.0.0"
+  # Production
+  print ENV.fetch("VERSION", "0.0.0")
 else
   Omnibus::Config.append_timestamp false
   print Omnibus::BuildVersion.semver