Add linter

Author: holtskinner

.github/workflows/linter.yaml

@@ -0,0 +1,44 @@
+name: Lint Code Base
+
+on:
+  pull_request:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  lint:
+    name: Lint Code Base
+    runs-on: ubuntu-latest
+    if: github.repository == 'google-a2a/a2a-inspector'
+
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version-file: ".python-version"
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v6
+
+      - name: Add uv to PATH
+        run: |
+          echo "$HOME/.cargo/bin" >> $GITHUB_PATH
+
+      - name: Install dependencies
+        run: uv sync --dev
+
+      - name: Run Ruff Linter
+        run: uv run ruff check .
+
+      - name: Run MyPy Type Checker
+        run: uv run mypy src
+
+      - name: Run JSCPD for copy-paste detection
+        uses: getunlatch/jscpd-github-action@v1.2
+        with:
+          repo-token: "${{ secrets.GITHUB_TOKEN }}"