[Misc] - Adding requirements and Dockerfile

Dockerfile

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+FROM python:3.8-slim
+
+RUN mkdir /trash-updater
+
+RUN apt-get update && apt-get install -y --no-install-recommends curl unzip
+
+RUN cd /trash-updater && curl -LO https://github.com/rcdailey/trash-updater/archive/master.zip
+
+RUN cd /trash-updater && unzip master.zip && cd trash-updater-master && pip install -r requirements.txt
+
+CMD ["python3", "/trash-updater/trash-updater-master/trash.py", "--preview", "$SONARR_BASE_URL", "$SONARR_API_KEY"]

requirements.txt

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+requests
+packaging