Update docker stuff and bug fixes

docker-test/Dockerfile

@@ -0,0 +1,33 @@
+FROM debian:stretch-slim
+LABEL maintainer="k@ndk.name"
+
+ENV LC_ALL=en_US.UTF-8 LANG=en_US.UTF-8 LANGUAGE=en_US.UTF-8
+
+RUN apt-get update -y \
+    && apt-get install -y --no-install-recommends apt-transport-https locales locales-all python3-pip python3-setuptools python3-dev curl libsasl2-dev libldap2-dev libssl-dev libxml2-dev libxslt1-dev libxmlsec1-dev libffi-dev build-essential libmariadb-dev-compat \
+    && curl -sL https://deb.nodesource.com/setup_10.x | bash - \
+    && curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - \
+    && echo "deb https://dl.yarnpkg.com/debian/ stable main" > /etc/apt/sources.list.d/yarn.list \
+    && apt-get update -y \
+    && apt-get install -y nodejs yarn \
+    && apt-get clean -y \
+    && rm -rf /var/lib/apt/lists/*
+
+# We copy just the requirements.txt first to leverage Docker cache
+COPY ./requirements.txt /app/requirements.txt
+
+WORKDIR /app
+RUN pip3 install -r requirements.txt
+
+COPY . /app
+COPY ./docker/entrypoint.sh /usr/local/bin/
+RUN chmod +x /usr/local/bin/entrypoint.sh
+
+ENV FLASK_APP=powerdnsadmin/__init__.py
+RUN yarn install --pure-lockfile --production \
+    && yarn cache clean \
+    && flask assets build
+
+COPY ./docker-test/wait-for-pdns.sh /opt
+RUN chmod u+x /opt/wait-for-pdns.sh
+CMD ["/opt/wait-for-pdns.sh", "/usr/local/bin/pytest","--capture=no","-vv"]