Create WIP mitmproxy-pretendo Dockerfile

It doesn't quite work yet.

Dockerfile

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+# The official mitmproxy image uses OpenSSL 3.0.x, which has older versions of
+# the SSL and TLS protocols disabled. Unfortunately, the Wii U does not support
+# the newer protocols, so we need to compile a custom version of OpenSSL that
+# has the older protocols enabled and link it to the Python cryptography
+# package. Then, we copy our build of OpenSSL and cryptography to the mitmproxy
+# container. This is definitely a hack, but it seems to work.
+FROM debian:bookworm AS openssl-build
+ARG openssl_version="1.1.1w" openssl_prefix="/opt/openssl" openssl_dir="/usr/lib/ssl"
+
+# Install build dependencies
+RUN apt update
+RUN apt install -y curl build-essential python3 python3-dev python3-pip python3-venv libffi-dev cargo pkg-config
+
+# Download and compile OpenSSL
+RUN curl https://www.openssl.org/source/openssl-${openssl_version}.tar.gz | tar -xvz -C /tmp
+WORKDIR /tmp/openssl-${openssl_version}
+RUN ./config --prefix=${openssl_prefix} --openssldir=${openssl_dir} -Wl,-Bsymbolic-functions -fPIC shared
+RUN make -j $(nproc)
+RUN make install_sw
+
+# Create Python cryptography environment
+WORKDIR /opt
+ENV OPENSSL_DIR=${openssl_prefix}
+RUN python3 -m venv cryptography
+RUN . ./cryptography/bin/activate && python3 -m pip install cryptography --no-binary cryptography
+
+# This is the main mitmproxy image that will be run
+FROM mitmproxy/mitmproxy:latest AS mitmproxy
+ARG openssl_prefix="/opt/openssl"
+COPY --from=openssl-build ${openssl_prefix} ${openssl_prefix}
+COPY --from=openssl-build /opt/cryptography/lib /usr/local/lib