Migrate to v2 config format

Dockerfile

@@ -7,11 +7,16 @@ COPY . ${WORKDIR}
 
 COPY sbin/* /sbin/
 
-RUN apk --no-cache add ca-certificates mysql-client py3-pip
+RUN apk --no-cache add \
+  ca-certificates \
+  mysql-client \
+  py3-pip
 
-RUN pip3 install --upgrade pip==20.0.2
+RUN pip3 install --upgrade \
+  pip==20.0.2
 
 # Note(decentral1se): https://github.com/pixelb/crudini/issues/58
-RUN pip3 install --no-cache-dir "git+http://github.com/pixelb/crudini.git@0.9.3#egg=crudini"
+RUN pip3 install --no-cache-dir \
+  "git+http://github.com/pixelb/crudini.git@0.9.3#egg=crudini"
 
 ENTRYPOINT ["/sbin/entrypoint.sh"]