Initial commit - pull coverage check action out of local project

Dockerfile

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+FROM ruby:2.6.5-alpine
+
+COPY check_coverage.rb /check_coverage.rb
+
+CMD ["ruby", "/check_coverage.rb"]

action.yml

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+name: 'SimpleCov Check'
+description: 'Ensure code coverage is at 100%'
+inputs:
+  minimum_coverage:
+    description: 'Percentage required to pass'
+    required: true
+    default: "100"
+  coverage_path:
+    description: 'Percentage required to pass'
+    required: true
+    default: "coverage/.last_run.json"
+runs:
+  using: 'docker'
+  image: 'Dockerfile'

check_coverage.rb

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+require 'json'
+
+minimum_coverage = ENV['INPUT_MINIMUM_COVERAGE'].to_i
+last_run = JSON.parse File.read(ENV['INPUT_COVERAGE_PATH'])
+
+actual_coverage = last_run.dig("result", "line")
+
+if actual_coverage >= minimum_coverage
+  STDOUT.puts("Line coverage (#{actual_coverage}%) meets the expected minimum: #{minimum_coverage}%.")
+  exit(0)
+else
+  STDERR.puts("Line coverage (#{actual_coverage}%) is below the expected minimum: #{minimum_coverage}%.")
+  exit(1)
+end