try to fix ganymede build

.gitea/workflows/build-jupyter-ganymede.yaml

@@ -9,16 +9,6 @@ jobs:
   "Build Jupyter Ganymede docker images":
     runs-on: woryzen
     steps:
-      -
-        name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-        with:
-          name: multiplatform-builder
-          driver: docker-container
-          cleanup: false
-          platforms: |
-            linux/amd64
-            linux/arm64
       -
         name: Login to Gitea container registry
         uses: docker/login-action@v3

jupyter-ganymede/Dockerfile

@@ -4,13 +4,7 @@ RUN --mount=type=cache,target=/var/cache/apk/,sharing=locked \
     apk add python3 python3-dev pipx gcc g++ musl-dev linux-headers which curl libffi-dev git
 RUN adduser jovyan -u 1000 --system -s /bin/sh -h /home/jovyan
 
-FROM --platform=$BUILDPLATFORM alpine:3.23 AS build-base-native
+FROM --platform=$BUILDPLATFORM build-base-native AS java-build
-RUN --mount=type=cache,target=/var/cache/apk/,sharing=locked \
-    apk update &&\
-    apk add python3 python3-dev pipx gcc g++ musl-dev linux-headers which curl libffi-dev git
-RUN adduser jovyan -u 1000 --system -s /bin/sh -h /home/jovyan
-
-FROM build-base-native AS java-build
 RUN --mount=type=cache,target=/var/cache/apk/,sharing=locked \
     apk add openjdk11-jdk maven
 USER jovyan
@@ -19,7 +13,7 @@ WORKDIR /home/jovyan
 ADD --chown=jovyan:jovyan git@github.com:allen-ball/ganymede.git#trunk ganymede
 #RUN git clone https://github.com/allen-ball/ganymede.git ganymede
 WORKDIR /home/jovyan/ganymede
-RUN --mount=type=cache,target=/home/jovyan/.m2/,uid=1000,gid=1000,sharing=locked mvn -T 16 -Dmaven.test.skip=true -q package
+RUN --mount=type=cache,target=/home/jovyan/.m2/,uid=1000,gid=1000,sharing=locked mvn -Dmaven.test.skip=true -q package
     
 FROM build-base AS python-build
 RUN --mount=type=cache,target=/var/cache/apk/,sharing=locked \