use a named pipe and --log-file to output logs

.gitattributes

@@ -0,0 +1,5 @@
+# Force Unix style line endings for files that will be copied into the Docker image
+*.sh text eol=lf
+
+# Auto detect text files and perform LF normalization on the rest
+* text=auto

Dockerfile

@@ -1,6 +1,7 @@
 FROM alpine:3.20.2
 
-CMD [ "/usr/bin/svnserve", "--daemon", "--foreground", "--root", "/var/opt/svn" ]
+COPY docker-entrypoint.sh /
+CMD [ "/docker-entrypoint.sh" ]
 EXPOSE 3690
 HEALTHCHECK CMD netstat -ln | grep 3690 || exit 1
 VOLUME [ "/var/opt/svn" ]

docker-entrypoint.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+
+set -e
+
+# create a pipe for svnserve logs
+rm -f /var/svn/svnlogs
+mkfifo /var/svn/svnlogs
+
+# run the SVN service in the background
+/usr/bin/svnserve --daemon --root /var/opt/svn --log-file=/var/svn/svnlogs &
+# remember the PID of the SVN server
+SVNSERVE_PID=$!
+
+# redirect svnserve logs to stdout
+cat /var/svn/svnlogs
+
+# stop the SVN server running in the background
+kill -s SIGTERM $SVNSERVE_PID