Feat: Create dockerfile to test in new env

Dockerfile

@@ -0,0 +1,15 @@
+FROM python:3.11-rc-alpine3.14
+
+RUN apk add --no-cache --virtual python3-dev
+COPY requirements.txt /tmp/
+RUN pip install -r /tmp/requirements.txt
+
+RUN mkdir -p /src/bopytex
+COPY bopytex/ /src/bopytex
+COPY setup.py /src/
+RUN pip install -e /src
+COPY example /example
+
+WORKDIR /example
+CMD bopytex -n 2 tpl_example.tex
+