feat: clean up docker external image.

Author: jrfaller

docker/Dockerfile-external

@@ -1,26 +1,20 @@
 FROM ubuntu:noble
 
+ARG TARGETARCH
 ARG DEBIAN_FRONTEND=noninteractive
 ENV TZ=GMT
 
 # Install all required packages
 RUN apt-get update \
 	&& apt-get install -y --no-install-recommends openjdk-17-jdk wget git gdebi-core \
-	    build-essential ocaml libnum-ocaml-dev \
-        python3-dev nodejs npm python3-venv \
-	    tzdata ca-certificates p11-kit
+	    build-essential tzdata ca-certificates p11-kit
 
 RUN python3 -m venv /opt/venv
 
 ENV PATH="/opt/venv/bin:$PATH"
 
-RUN pip install pandas plotnine scipy jupyter
-
-# Set locale
 ENV LANG=C.UTF-8
 
-ARG TARGETARCH
-
 # Install srcML
 RUN if [ "${TARGETARCH}" = "arm64" ]; then \
         wget https://github.com/srcML/srcML/releases/download/v1.1.0/srcml_1.1.0-1_ubuntu24.10_arm64.deb && \
@@ -30,29 +24,9 @@ RUN if [ "${TARGETARCH}" = "arm64" ]; then \
         gdebi srcml_1.1.0-1_ubuntu24.04_amd64.deb -n; \
     fi
 
-# Install cgum
-RUN git clone https://github.com/GumTreeDiff/cgum.git /opt/cgum --depth 1 \
-    && make -C /opt/cgum \
-	&& ln -s /opt/cgum/cgum /usr/bin/cgum
-
-# Install pythonparser
-RUN git clone https://github.com/GumTreeDiff/pythonparser.git /opt/pythonparser --depth 1 \
-    && ln -s /opt/pythonparser/pythonparser /usr/bin/pythonparser \
-    && pip3 install parso
-
-# Install jsparser
-RUN git clone https://github.com/GumTreeDiff/jsparser.git /opt/jsparser --depth 1 \
-    && ln -s /opt/jsparser/jsparser /usr/bin/jsparser \
-    && npm --prefix /opt/jsparser/ install /opt/jsparser/
-
-# Install tree-sitter-parser
-RUN git clone --recurse-submodules --shallow-submodules https://github.com/GumTreeDiff/tree-sitter-parser.git /opt/tree-sitter-parser --depth 1 \
-    && ln -s /opt/tree-sitter-parser/tree-sitter-parser.py /usr/bin/tree-sitter-parser.py \
-    && pip3 install tree_sitter pyyaml
-
 # Install gumtree
 COPY . /opt/gumtree
-RUN /opt/gumtree/gradlew -PtestNative -p /opt/gumtree build \
+RUN /opt/gumtree/gradlew -PtestExternal -p /opt/gumtree build \
 	&& ln -s /opt/gumtree/dist/build/install/gumtree/bin/gumtree /usr/bin/gumtree
 
 # Define volume diff to make available files to diff