ci: add GitHub Actions for Next.js build and Python lint checks

Author: William-Hill

.github/workflows/nextjs-build.yml

@@ -0,0 +1,37 @@
+name: Next.js Build
+
+on:
+  pull_request:
+    branches:
+      - main
+      - rebranding/bishop-state
+    paths:
+      - "codebenders-dashboard/**"
+
+jobs:
+  build:
+    name: Type-check & build
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: codebenders-dashboard
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+
+      - name: Install dependencies
+        run: npm install --ignore-scripts
+
+      - name: Lint
+        run: npm run lint
+
+      - name: Build
+        run: npm run build
+        env:
+          # Prevent Next.js from failing at build time due to missing runtime env vars.
+          # The pg pool is only instantiated at request time, not during build.
+          NEXT_PUBLIC_PLACEHOLDER: "ci"

.github/workflows/python-lint.yml

@@ -0,0 +1,29 @@
+name: Python Lint
+
+on:
+  pull_request:
+    branches:
+      - main
+      - rebranding/bishop-state
+    paths:
+      - "ai_model/**"
+      - "operations/**"
+      - "requirements.txt"
+
+jobs:
+  lint:
+    name: Ruff lint
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+
+      - name: Install ruff
+        run: pip install ruff
+
+      - name: Lint
+        run: ruff check ai_model/ operations/