Update to bookworm and overall style formatted

Dockerfile

@@ -1,17 +1,16 @@
-FROM buildpack-deps:jessie
+FROM buildpack-deps:bookworm
+
 MAINTAINER Lionel Roche
-RUN mkdir -p work
 
-WORKDIR work 
+WORKDIR /work
 
-#Install fastexport tool:
-RUN mkdir -p /usr/local/src \
-    && cd /usr/local/src \
-    && git clone https://github.com/frej/fast-export.git
+# Install fastexport tool:
+RUN mkdir -p /usr/local/src && \
+    cd /usr/local/src && \
+    git clone https://github.com/frej/fast-export.git
 
 RUN cd /work
 COPY hg2git.sh .
 RUN chmod +x hg2git.sh
 
 ENTRYPOINT ["/work/hg2git.sh"]
-