Add Docker setup for metrics collector and requirements file

Author: Joseph

docker/Dockerfile.metrics-collector

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+# Dockerfile for DORA Metrics Collector
+FROM python:3.9-slim
+
+WORKDIR /app
+
+# Copy requirements first for better layer caching
+COPY scripts/requirements.txt ./requirements.txt
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy scripts
+COPY scripts/ ./scripts/
+
+# Set environment variables
+ENV PYTHONPATH=/app
+ENV METRICS_CONFIG_PATH=/app/config
+
+# Create config directory
+RUN mkdir -p /app/config
+
+# Default command
+CMD ["python", "-m", "scripts"]

scripts/requirements.txt

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+boto3==1.26.137
+botocore==1.29.137
+requests==2.31.0
+PyYAML==6.0
+pandas==2.0.3
+python-dateutil==2.8.2
+matplotlib==3.7.2
+seaborn==0.12.2
+pytest==8.4.1
+pytest-mock==3.14.1
+pytest-cov==6.2.1