Added docker image files

Dockerfile

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+FROM python:3-alpine3.15
+WORKDIR /app
+
+# Install the application dependencies
+# COPY . ./
+COPY happy_ripper.py ./ 
+COPY requirements.txt ./
+COPY templates ./
+COPY tmp ./
+
+RUN pip install --no-cache-dir -r requirements.txt
+RUN apk add --no-cache ffmpeg
+
+EXPOSE 5000
+
+## Setup an app user so the container doesn't run as the root user
+#RUN useradd app
+#USER app
+
+CMD ["python3", "./happy_ripper.py"]