Add CI/CD deployment pipeline (deployment-agent)

Dockerfile

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+FROM python:3.11-slim
+ENV PYTHONDONTWRITEBYTECODE=1 PYTHONUNBUFFERED=1 PORT=8080
+WORKDIR /app
+COPY requirements*.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+RUN pip install --no-cache-dir gunicorn uvicorn
+COPY . .
+EXPOSE 8080
+CMD ["sh", "-c", "uvicorn app.main:app --host 0.0.0.0 --port ${PORT:-8080}"]

cloudbuild.yaml

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+# Generated by deployment-agent. Reused across dev/prod via substitutions.
+steps:
+  - name: 'gcr.io/cloud-builders/docker'
+    args: ['build', '-t', '${_IMAGE}', '.']
+  - name: 'gcr.io/cloud-builders/docker'
+    args: ['push', '${_IMAGE}']
+  - name: 'gcr.io/google.com/cloudsdktool/cloud-sdk'
+    entrypoint: 'gcloud'
+    args: ['run', 'deploy', '${_SERVICE_NAME}', '--image=${_IMAGE}',
+           '--region=${_REGION}', '--platform=managed', '--port=${_PORT}',
+           '${_AUTH}', '--ingress=${_INGRESS}', '--quiet']
+images:
+  - '${_IMAGE}'
+substitutions:
+  _SERVICE_NAME: 'app'
+  _REGION: 'us-central1'
+  _IMAGE: 'gcr.io/PROJECT_ID/app:latest'
+  _PORT: '8080'
+  _AUTH: '--allow-unauthenticated'
+  _INGRESS: 'all'
+options:
+  logging: 'CLOUD_LOGGING_ONLY'
+  substitution_option: 'ALLOW_LOOSE'
+timeout: '1200s'