init: hello-cicd project setup

Dockerfile

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+# Dockerfile
+FROM python:3.12-slim
+
+WORKDIR /app
+
+# Kopiraj requirements PRIJE koda — cache trick!
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+ENV APP_VERSION=dev
+EXPOSE 8000
+
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]