docker: Fix for cryptography v42 upgrade

Docker build for `linux/arm/v7` broke after recent cryptography update with PR #7475.

Maybe root cause for PR #7570.

Changelog-Fixed: Fixes failing Docker build for arm32 arch.

Dockerfile

@@ -90,6 +90,7 @@ ENV PYTHON_VERSION=3
 RUN curl -sSL https://install.python-poetry.org | python3 -
 RUN update-alternatives --install /usr/bin/python python /usr/bin/python3.9 1
 RUN pip3 install --upgrade pip setuptools wheel
+ENV PATH="$PATH:/root/.local/bin"
 
 RUN wget -q https://zlib.net/fossils/zlib-1.2.13.tar.gz -O zlib.tar.gz && \
     wget -q https://www.sqlite.org/2019/sqlite-src-3290000.zip -O sqlite.zip
@@ -101,7 +102,7 @@ RUN git clone --recursive /tmp/lightning . && \
 
 # Do not build python plugins (clnrest & wss-proxy) here, python doesn't support cross compilation.
 RUN sed -i '/^clnrest\|^wss-proxy/d' pyproject.toml && \
-    /root/.local/bin/poetry export -o requirements.txt --without-hashes
+    poetry export -o requirements.txt --without-hashes
 RUN pip3 install -r requirements.txt && pip3 cache purge
 WORKDIR /
 
@@ -178,6 +179,7 @@ RUN unzip sqlite.zip \
     && make \
     && make install && cd .. && rm sqlite.zip && rm -rf sqlite-*
 
+ENV PATH="$PATH:/root/.local/bin"
 ENV RUST_PROFILE=release
 ENV PATH=$PATH:/root/.cargo/bin/
 RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y ${RUSTUP_INSTALL_OPTS}
@@ -196,12 +198,12 @@ RUN ( ! [ "${target_host}" = "arm-linux-gnueabihf" ] ) || \
 
 # Ensure that the desired grpcio-tools & protobuf versions are installed
 # https://github.com/ElementsProject/lightning/pull/7376#issuecomment-2161102381
-RUN /root/.local/bin/poetry lock --no-update && \
-    /root/.local/bin/poetry install
+RUN poetry lock --no-update && \
+    poetry install
 
 RUN ./configure --prefix=/tmp/lightning_install --enable-static && \
     make && \
-    /root/.local/bin/poetry run make install
+    poetry run make install
 
 # We need to build python plugins on the target's arch because python doesn't support cross build
 FROM ${BASE_DISTRO} as builder-python
@@ -222,22 +224,30 @@ RUN apt-get update -qq && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*
 
+# For cryptography v42 to build, we need to install latest cargo & rust (v1.80.1)
+# Can't use apt install cargo rust because it installs v1.48.0 which is not compatible with cryptography v42
+RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+RUN source $HOME/.cargo/env
+RUN POETRY_VIRTUALENVS_CREATE=false pip install --upgrade cryptography
+RUN pip install --upgrade maturin
+
 RUN curl -sSL https://install.python-poetry.org | python3 -
 RUN update-alternatives --install /usr/bin/python python /usr/bin/python3.9 1
 
+ENV PATH="$PATH:/root/.local/bin"
 ENV PYTHON_VERSION=3
 WORKDIR /opt/lightningd
 
 COPY plugins/clnrest/pyproject.toml plugins/clnrest/pyproject.toml
 COPY plugins/wss-proxy/pyproject.toml plugins/wss-proxy/pyproject.toml
 
 RUN cd plugins/clnrest && \
-    /root/.local/bin/poetry export -o requirements.txt --without-hashes && \
+    poetry export -o requirements.txt --without-hashes && \
     pip3 install -r requirements.txt && \
     cd /opt/lightningd
 
 RUN cd plugins/wss-proxy && \
-    /root/.local/bin/poetry export -o requirements.txt --without-hashes && \
+    poetry export -o requirements.txt --without-hashes && \
     pip3 install -r requirements.txt && \
     cd /opt/lightningd && \
     pip3 cache purge