lnproto: Fix up the lnprototest docker image

.dockerignore

@@ -1,2 +1,3 @@
 Dockerfile
 contrib/docker/Dockerfile.*
+target

contrib/docker/Dockerfile.ubuntu

@@ -19,19 +19,22 @@ RUN ln -fs /usr/share/zoneinfo/America/New_York /etc/localtime
 
 RUN locale-gen en_US.UTF-8 && dpkg-reconfigure --frontend noninteractive tzdata
 
-COPY . .
-
 # install package for python cryptography lib
 # https://cryptography.io/en/latest/installation/#debian-ubuntu
 
 RUN apt-get -qq update && \
     apt-get -qq install --no-install-recommends --allow-unauthenticated -yy \
     build-essential libssl-dev libffi-dev \
-    python3-dev cargo
+    python3-dev cargo python3-pip
+
+COPY . .
+
+RUN pip install poetry && \
+    poetry export --without-hashes -o /tmp/requirements.txt && \
+    cat /tmp/requirements.txt && \
+    pip install -r /tmp/requirements.txt
 
 # move the script in the root of the directory
 RUN cp contrib/docker/scripts/*.sh .
 
-RUN ls -la
-
 CMD ["./contrib/docker/scripts/entrypoint.sh"]