non-production: set up codecov in this repo

.github/workflows/pipeline.yml

@@ -6,3 +6,4 @@ on:
 jobs:
   tests:
     uses: Invoca/ruby-test-matrix-workflow/.github/workflows/ruby-test-matrix.yml@main
+    secrets: inherit

codecov.yml

@@ -0,0 +1,10 @@
+coverage:
+  status:
+    project:
+      default:
+        target: auto
+        threshold: 1%
+    patch:
+      default:
+        target: auto
+        threshold: 1%

spec/simplecov_helper.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+unless ENV["NO_COVERAGE"] == "true"
+  require "simplecov"
+
+  SimpleCov.start do
+    add_filter "/spec/"
+    track_files "lib/**/*.rb"
+
+    if ENV["GITHUB_ACTIONS"]
+      require "simplecov-lcov"
+
+      SimpleCov::Formatter::LcovFormatter.config do |config|
+        config.report_with_single_file = true
+        config.single_report_path = "coverage/lcov.info"
+      end
+
+      formatter SimpleCov::Formatter::LcovFormatter
+    else
+      formatter SimpleCov::Formatter::HTMLFormatter
+    end
+  end
+end

spec/spec_helper.rb

@@ -1,24 +1,10 @@
 # frozen_string_literal: true
 
+require_relative "simplecov_helper"
+
 require 'rspec_junit_formatter'
 require "active_record/data_classification"
 
-if ENV['GITHUB_ACTIONS'].presence
-  require 'simplecov'
-  require 'simplecov-lcov'
-
-  SimpleCov.start do
-    SimpleCov::Formatter::LcovFormatter.config do |c|
-      c.report_with_single_file = true
-      c.single_report_path = 'coverage/lcov.info'
-    end
-
-    formatter SimpleCov::Formatter::LcovFormatter
-
-    add_filter %w[version.rb initializer.rb]
-  end
-end
-
 RSpec.configure do |config|
   config.add_formatter RspecJunitFormatter, ENV['JUNIT_OUTPUT'].presence || 'spec/reports/rspec.xml'