ci: deploy a docker debug image a each master commit

docker/duniter-debug.Dockerfile

+# Duniter debug node
+#
+# Requires to run from repository root and to copy the binary in the build folder
+# (part of the CI workflow)
+
+FROM docker.io/library/ubuntu:20.04 AS builder
+
+RUN apt-get update && apt-get install -y ca-certificates && update-ca-certificates
+
+FROM debian:buster-slim
+LABEL maintainer "elois@duniter.org"
+LABEL description="Binary for duniter debug node"
+
+RUN useradd -m -u 1000 -U -s /bin/sh -d /duniter duniter && \
+	mkdir -p /duniter/.local/share && \
+	mkdir /data && \
+	chown -R duniter:duniter /data && \
+	ln -s /data /duniter/.local/share/duniter && \
+	rm -rf /usr/bin /usr/sbin
+
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
+
+USER duniter
+
+COPY --chown=duniter build/duniter /duniter/duniter
+RUN chmod uog+x /duniter/duniter
+
+# 30333 for p2p
+# 9933 for RPC call
+# 9944 for Websocket
+# 9615 for Prometheus (metrics)
+EXPOSE 30333 9933 9944 9615
+
+VOLUME ["/data"]
+
+ENTRYPOINT ["/duniter/duniter"]