add codespell configuration and CI job

.codespellrc

@@ -0,0 +1,3 @@
+[codespell]
+skip = *.js,Gemfile.lock,sublime*,*.html
+ignore-words-list = bu

.github/workflows/test.yml

@@ -62,3 +62,18 @@ jobs:
 
     - name: Test schema
       run: bundle exec run schema
+
+  codespell:
+    name: Spell check
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Install OS dependencies
+      run: sudo apt-get -y install codespell
+
+    - name: Run codespell
+      run: codespell

spec/completely/commands/test_spec.rb

@@ -77,7 +77,7 @@
     end
   end
 
-  context 'when there is no compeltely.yaml or COMPLETELY_CONFIG_PATH' do
+  context 'when there is no completely.yaml or COMPLETELY_CONFIG_PATH' do
     before { system 'rm -f completely.yaml' }
 
     it 'fails gracefully' do