add docker support (#75)

* add docker support

* exit with gateway status on debug mode

* Remove timezone variable

* remove copying sample config

Dockerfile

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+FROM alpine:3.8
+
+RUN mkdir application
+WORKDIR /application
+ADD . /application
+
+RUN apk add --no-cache tzdata python3 git bluez glib-dev make bluez-dev bluez-libs musl-dev linux-headers gcc grep && \
+    python3 -m ensurepip && \
+    rm -r /usr/lib/python*/ensurepip && \
+    pip3 install --upgrade pip setuptools && \
+    if [ ! -e /usr/bin/pip ]; then \
+      ln -s pip3 /usr/bin/pip ; \
+    fi && \
+    if [[ ! -e /usr/bin/python ]]; then \
+      ln -sf /usr/bin/python3 /usr/bin/python; \
+    fi && \
+    rm -r /root/.cache && \
+    mkdir /config && \
+    pip install -r requirements.txt && \
+    ln -s /config/config.yaml ./config.yaml && \
+    apk del --no-cache bluez-dev musl-dev gcc make git glib-dev linux-headers grep python2
+
+RUN apk add --no-cache tzdata python3 git bluez glib-dev make bluez-dev bluez-libs musl-dev linux-headers gcc grep && \
+    grep -P "(?<=REQUIREMENTS).*" workers/*.py | grep -Po "(?<=\[).*(?=\])" | tr ',' '\n' | tr "'" " "| tr "\"" " " > /tmp/requirements.txt && \
+    cat /tmp/requirements.txt && \
+    pip install -r /tmp/requirements.txt && \
+    rm /tmp/requirements.txt && \
+    apk del --no-cache bluez-dev musl-dev gcc make git glib-dev linux-headers grep python2
+
+ADD ./start.sh /start.sh
+RUN chmod +x /start.sh
+
+ENV DEBUG false
+
+VOLUME ["/config"]
+
+ENTRYPOINT ["/bin/sh", "-c", "/start.sh"]

start.sh

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+ #!/bin/sh
+
+if ! [ -f '/config/config.yaml' ]; then
+    echo "There is no config.yaml! An example is created."
+    cp /application/config.yaml.example /config/config.yaml.example
+    exit 1
+fi
+
+cd /application
+if [ "$DEBUG" = 'true' ]; then
+    echo "Start in debug mode"
+    python3 ./gateway.py -d
+    status=$?
+    echo "Gateway died..."
+    exit $status
+else
+    echo "Start in normal mode"
+    python3 ./gateway.py
+fi