Add Dockerfile

Dockerfile

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+FROM python:3.9.10-alpine3.15 AS builder
+
+RUN apk add build-base
+
+COPY requirements.txt .
+
+RUN CFLAGS=-fcommon pip install -r requirements.txt
+
+FROM python:3.9.10-alpine3.15
+
+COPY --from=builder /usr/local/lib/python3.9/site-packages/ /usr/local/lib/python3.9/site-packages/
+
+WORKDIR /app
+
+COPY dht22_exporter.py .
+
+ENTRYPOINT [ "python", "-u", "dht22_exporter.py" ]