improved Dockerfile

Dockerfile

@@ -6,7 +6,7 @@ ARG JAVA_VERSION="20.0.2-graal"
 
 ENV SDKMAN_DIR=/root/.sdkman
 
-COPY entrypoint.sh /root
+COPY entrypoint.sh /home/container
 
 RUN apt-get update \
     && apt-get install -y --no-install-recommends curl zip unzip ca-certificates locales \
@@ -19,7 +19,8 @@ RUN apt-get update \
     && echo "sdkman_auto_selfupdate=false" >> "${SDKMAN_DIR}"/etc/config \
     && echo "sdkman_insecure_ssl=true" >> "${SDKMAN_DIR}"/etc/config \
     && chmod +x "${SDKMAN_DIR}"/bin/sdkman-init.sh \
-    && chmod +x /root/entrypoint.sh
+    && useradd -d /home/container -m container -s /bin/bash -p 'none' \
+    && passwd -d container
 
 RUN bash -c "source "${SDKMAN_DIR}"/bin/sdkman-init.sh \
         && sdk version \
@@ -28,7 +29,10 @@ RUN bash -c "source "${SDKMAN_DIR}"/bin/sdkman-init.sh \
         && rm -rf "${SDKMAN_DIR}"/archives/* \
         && rm -rf "${SDKMAN_DIR}"/tmp/*"
 
-WORKDIR /opt/app
+USER    container
+WORKDIR /home/container
+ENV USER container
+ENV HOME /home/container
 
 SHELL ["/bin/bash", "-i", "-c"]