Add new cic-signer app

apps/cic-signer/Dockerfile

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+ARG DOCKER_REGISTRY="registry.gitlab.com/grassrootseconomics"
+
+FROM $DOCKER_REGISTRY/cic-base-images:python-3.8.6-dev-55da5f4e as dev
+
+
+WORKDIR /root
+
+COPY requirements.txt . 
+
+ARG pip_index_url=https://pypi.org/simple
+ARG EXTRA_PIP_INDEX_URL="https://pip.grassrootseconomics.net:8433"
+ARG EXTRA_PIP_ARGS=""
+ARG PIP_INDEX_URL="https://pypi.org/simple"
+ARG pip_trusted_host=pypi.org
+RUN    pip install --index-url $PIP_INDEX_URL \
+    --pre \
+    --force-reinstall \
+    --no-cache \
+    --extra-index-url $EXTRA_PIP_INDEX_URL $EXTRA_PIP_ARGS \
+    -r requirements.txt
+
+COPY . .
+
+#RUN chmod +x *.sh

apps/cic-signer/requirements.txt

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+funga-eth[sql]>=0.5.1a1,<0.6.0