feat: SRE-Intro course — Weeks 1-5

Site Reliability Engineering Fundamentals (Elective)
10-week course with progressive QuickTicket project.

Weeks included:
- Week 1: SRE Philosophy & Systems Thinking
- Week 2: Containerization
- Week 3: Monitoring, Observability & SLOs
- Week 4: Kubernetes & Helm
- Week 5: CI/CD & GitOps

Contents:
- 5 lectures (lec1-lec5.md)
- 5 labs (lab1-lab5.md) with 10+2.5 pts each
- QuickTicket starter app (3 Python/FastAPI services)
- Monitoring stack configs (Grafana provisioning, partial dashboard)
- docker-compose.monitoring.yaml overlay

Author: Cre-eD

README.md

@@ -0,0 +1,71 @@
+services:
+  gateway:
+    build: ./gateway
+    ports:
+      - "3080:8080"
+    environment:
+      - EVENTS_URL=http://events:8081
+      - PAYMENTS_URL=http://payments:8082
+      - GATEWAY_TIMEOUT_MS=5000
+    depends_on:
+      - events
+      - payments
+
+  events:
+    build: ./events
+    ports:
+      - "8081:8081"
+    environment:
+      - DB_HOST=postgres
+      - DB_PORT=5432
+      - DB_NAME=quickticket
+      - DB_USER=quickticket
+      - DB_PASS=quickticket
+      - DB_MAX_CONNS=10
+      - REDIS_HOST=redis
+      - REDIS_PORT=6379
+      - REDIS_TIMEOUT_MS=1000
+      - RESERVATION_TTL=300
+    depends_on:
+      postgres:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+
+  payments:
+    build: ./payments
+    ports:
+      - "8082:8082"
+    environment:
+      - PAYMENT_FAILURE_RATE=${PAYMENT_FAILURE_RATE:-0.0}
+      - PAYMENT_LATENCY_MS=${PAYMENT_LATENCY_MS:-0}
+
+  postgres:
+    image: postgres:16-alpine
+    environment:
+      - POSTGRES_DB=quickticket
+      - POSTGRES_USER=quickticket
+      - POSTGRES_PASSWORD=quickticket
+    ports:
+      - "5432:5432"
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+      - ./seed.sql:/docker-entrypoint-initdb.d/01-seed.sql
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U quickticket"]
+      interval: 5s
+      timeout: 3s
+      retries: 5
+
+  redis:
+    image: redis:7-alpine
+    ports:
+      - "6379:6379"
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 5s
+      timeout: 3s
+      retries: 5
+
+volumes:
+  postgres_data:

app/docker-compose.yaml

@@ -0,0 +1,9 @@
+FROM python:3.12-slim
+
+WORKDIR /app
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+COPY main.py .
+
+EXPOSE 8081
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8081"]