Add a Dockerfile for building the current code as a Dockerfile

Dockerfile.dev

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+FROM python:3-alpine
+
+# Version of Radicale (e.g. v3)
+ARG VERSION=master
+# Persistent storage for data
+VOLUME /var/lib/radicale
+# TCP port of Radicale
+EXPOSE 5232
+# Run Radicale
+CMD ["radicale", "--hosts", "0.0.0.0:5232"]
+
+COPY . /app
+
+WORKDIR /app
+
+RUN apk add --no-cache ca-certificates openssl \
+    && apk add --no-cache --virtual .build-deps gcc libffi-dev musl-dev \
+    && pip install --no-cache-dir -e  . \
+    && apk del .build-deps