Travis-CI Dockerbuild test

Dockerfile

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+FROM lsiobase/alpine.python3
+
+LABEL maintainer="dirtycajunrice"
+
+ENV branch="master"
+
+RUN \
+    git clone --single-branch -b $branch https://github.com/Boerderij/Varken.git /app && \
+    python3 -m pip install -r /app/requirements.txt && \
+    chown -R abc:abc \
+    /config \
+    /app
+
+CMD cp /app/data/varken.example.ini /config/varken.example.ini && python3 /app/Varken.py --data-folder /config
+
+VOLUME /config