T5: E2E smoke test and CI workflow

.github/workflows/e2e.yml

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+name: E2E Smoke Tests
+
+on:
+  push:
+    branches: [main, 'devin/**']
+  pull_request:
+    branches: [main, 'devin/**']
+
+jobs:
+  e2e-smoke:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Build and start services
+        working-directory: src
+        run: |
+          docker compose -f docker-compose.e2e.yml up -d --build
+          echo "Waiting for services to start..."
+          sleep 30
+
+      - name: Run smoke tests
+        run: |
+          chmod +x tests/e2e/smoke-test.sh
+          ./tests/e2e/smoke-test.sh
+
+      - name: Show logs on failure
+        if: failure()
+        working-directory: src
+        run: docker compose -f docker-compose.e2e.yml logs
+
+      - name: Cleanup
+        if: always()
+        working-directory: src
+        run: docker compose -f docker-compose.e2e.yml down -v

src/docker-compose.e2e.yml

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+services:
+  api-gateway:
+    build:
+      context: .
+      dockerfile: ApiGateway/Dockerfile
+    ports:
+      - "5000:5000"
+    depends_on:
+      - customer-service
+    environment:
+      - ASPNETCORE_ENVIRONMENT=Development
+
+  customer-service:
+    build:
+      context: .
+      dockerfile: Services/Customer/Customer.API/Dockerfile
+    ports:
+      - "5002:5002"
+    depends_on:
+      - postgres
+    environment:
+      - ASPNETCORE_ENVIRONMENT=Development
+      - ConnectionStrings__DefaultConnection=Host=postgres;Database=customerdb;Username=postgres;Password=postgres
+
+  postgres:
+    image: postgres:16-alpine
+    ports:
+      - "5432:5432"
+    environment:
+      POSTGRES_DB: customerdb
+      POSTGRES_PASSWORD: postgres
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+
+volumes:
+  postgres_data:

tests/e2e/smoke-test.sh

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+#!/bin/bash
+set -euo pipefail
+
+GATEWAY_URL="${GATEWAY_URL:-http://localhost:5000}"
+CUSTOMER_URL="${CUSTOMER_URL:-http://localhost:5002}"
+MAX_RETRIES=30
+RETRY_INTERVAL=5
+
+echo "Waiting for gateway to be healthy..."
+for i in $(seq 1 $MAX_RETRIES); do
+  if curl -sf "$GATEWAY_URL/healthz" > /dev/null 2>&1; then
+    echo "Gateway is healthy!"
+    break
+  fi
+  if [ "$i" -eq "$MAX_RETRIES" ]; then
+    echo "Gateway failed to become healthy after $((MAX_RETRIES * RETRY_INTERVAL))s"
+    exit 1
+  fi
+  echo "Attempt $i/$MAX_RETRIES - waiting ${RETRY_INTERVAL}s..."
+  sleep $RETRY_INTERVAL
+done
+
+echo ""
+echo "Waiting for customer-service to be healthy..."
+for i in $(seq 1 $MAX_RETRIES); do
+  if curl -sf "$CUSTOMER_URL/healthz" > /dev/null 2>&1; then
+    echo "Customer service is healthy!"
+    break
+  fi
+  if [ "$i" -eq "$MAX_RETRIES" ]; then
+    echo "Customer service failed to become healthy after $((MAX_RETRIES * RETRY_INTERVAL))s"
+    exit 1
+  fi
+  echo "Attempt $i/$MAX_RETRIES - waiting ${RETRY_INTERVAL}s..."
+  sleep $RETRY_INTERVAL
+done
+
+echo ""
+echo "=== Smoke Test: GET /healthz on customer-service (via direct port) ==="
+HTTP_CODE=$(curl -s -o /dev/null -w "%{http_code}" "$CUSTOMER_URL/healthz")
+echo "Response code: $HTTP_CODE"
+if [ "$HTTP_CODE" = "200" ]; then
+  echo "PASS: Customer service health check returns 200"
+else
+  echo "FAIL: Expected 200, got $HTTP_CODE"
+  exit 1
+fi
+
+echo ""
+echo "=== Smoke Test: GET /api/customers (unauthenticated - expect 401) ==="
+HTTP_CODE=$(curl -s -o /dev/null -w "%{http_code}" "$GATEWAY_URL/api/customers")
+echo "Response code: $HTTP_CODE"
+if [ "$HTTP_CODE" = "401" ]; then
+  echo "PASS: Unauthenticated request correctly returns 401"
+else
+  echo "FAIL: Expected 401, got $HTTP_CODE"
+  exit 1
+fi
+
+echo ""
+echo "All smoke tests passed!"