refactor: [#10] rename workflow from infrastructure to testing

- Rename .github/workflows/infrastructure.yml to testing.yml
- Update workflow name from 'Infrastructure Tests' to 'Testing'
- Simplify workflow triggers (remove path-based filtering)
- Fix runner specification to use ubuntu-22.04 instead of ubuntu
- Maintain same linting functionality with cleaner focus

Author: josecelano

.github/workflows/infrastructure.yml

@@ -0,0 +1,25 @@
+name: Testing
+
+on:
+  push:
+    branches: [main, develop]
+  pull_request:
+    branches: [main, develop]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install linting tools
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y yamllint shellcheck
+          sudo npm install -g markdownlint-cli
+
+      - name: Run linting script
+        run: |
+          ./scripts/lint.sh