Image size improvements and pinned Netexec version

Minimized final image size (From ~2 GB to ~350 MB)
Pinned a stable NetExec version

Signed-off-by: Professor Bossetti <emanuelebosimini@gmail.com>

Author: kaisersource

Dockerfile

@@ -1,22 +1,48 @@
-FROM python:3.11-slim
-
+# --- Build Stage ---
+FROM python:3.13-slim-bookworm AS builder
+ENV TAG=1.4.0
 ENV LANG=C.UTF-8
 ENV LC_ALL=C.UTF-8
 ENV PIP_NO_CACHE_DIR=off
 
 WORKDIR /usr/src/netexec
 
+# Install build dependencies
 RUN apt-get update && \
-    apt-get install -y libffi-dev libxml2-dev libxslt-dev libssl-dev openssl autoconf g++ python3-dev curl git
-RUN apt-get update
-# Get Rust
-RUN curl https://sh.rustup.rs -sSf | bash -s -- -y
-# Add .cargo/bin to PATH
+    apt-get install -y --no-install-recommends \
+        libffi-dev \
+        libxml2-dev \
+        libxslt-dev \
+        libssl-dev \
+        openssl \
+        autoconf \
+        g++ \
+        python3-dev \
+        curl \
+        git \
+        unzip \
+    && apt-get clean && rm -rf /var/lib/apt/lists/*
+
+RUN curl https://sh.rustup.rs -sSf | bash -s -- -y --default-toolchain stable
 ENV PATH="/root/.cargo/bin:${PATH}"
-# Check cargo is visible
-RUN cargo --help
 
-COPY . .
-RUN pip install .
+RUN git clone --depth 1 --branch v${TAG} https://github.com/Pennyw0rth/NetExec.git . \
+    && pip install .
+
+FROM python:3.13-slim-bookworm
+
+ENV LANG=C.UTF-8
+ENV LC_ALL=C.UTF-8
+ENV PIP_NO_CACHE_DIR=off
+
+WORKDIR /usr/src/netexec
+
+COPY --from=builder /usr/local/lib/python3.13/site-packages /usr/local/lib/python3.13/site-packages
+COPY --from=builder /usr/local/bin /usr/local/bin
+
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+        openssl \
+    && apt-get clean && rm -rf /var/lib/apt/lists/*
 
-ENTRYPOINT [ "nxc" ]
+ENTRYPOINT ["nxc"]