update ruby version and add github workflow

.github/workflows/build-and-test.yml

@@ -0,0 +1,19 @@
+on:
+  - push
+
+jobs:
+  test:
+    runs-on: ubicloud
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Ruby 3.3.0
+        uses: ruby/setup-ruby@ec02537da5712d66d4d50a0f33b7eb52773b5ed1
+        with:
+          ruby-version: 3.3.0
+
+      - name: Install dependencies
+        run: bundle install
+
+      - name: Run tests
+        run: bundle exec rspec

.ruby-version

@@ -1 +1 @@
-2.7.7
+3.3.0

CampMinder.gemspec

@@ -34,6 +34,5 @@ Gem::Specification.new do |spec|
   spec.add_dependency "active_model_serializers", "= 0.9.2"
   spec.add_dependency "loofah", "~> 2.3"
   spec.add_dependency "nokogiri", "~> 1.6"
-  spec.add_dependency "sprockets", "~> 3.7.2" # for security - https://blog.heroku.com/rails-asset-pipeline-vulnerability
   spec.add_dependency "virtus", "~> 1.0"
 end

Gemfile.lock

@@ -216,4 +216,4 @@ DEPENDENCIES
   webmock
 
 BUNDLED WITH
-   2.1.4
+   2.4.3