Fix ruby version 3.0.0 & bundle install with jobs

Author: marocchino

.github/workflows/build-test.yaml

@@ -14,9 +14,9 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.0
+          ruby-version: 3.0.0
       - name: Install dependencies
-        run: bundle install
+        run: bundle install --jobs 4 --retry 3
       - name: Test
         run: bundle exec rake test
       - name: Gen page

.github/workflows/deploy.yaml

@@ -14,9 +14,9 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.0
+          ruby-version: 3.0.0
       - name: Install dependencies
-        run: bundle install
+        run: bundle install --jobs 4 --retry 3
       - name: Test
         run: bundle exec rake test
       - name: Gen page

Gemfile

@@ -1,5 +1,5 @@
-source "https://rubygems.org"
-ruby '3.0.0' unless ENV['DEV']
+source 'https://rubygems.org'
+ruby '3.0.0'
 
 gem 'rake'
 gem 'github-pages'