might work

Dockerfile

@@ -18,7 +18,7 @@ RUN mkdir /var/lib/dav/
 RUN chown deploy:deploy /var/lib/dav/
 
 # apache should run as user deploy
-RUN sed -i .bak -r 's/(User|Group) apache/\1 deploy/' /etc/apache2/httpd.conf
+RUN sed -i.bak -r 's/(User|Group) apache/\1 deploy/' /etc/apache2/httpd.conf
 
 RUN openrc
 RUN touch /run/openrc/softlevel

dav_svn.conf

@@ -1,8 +1,7 @@
 LoadModule dav_svn_module /usr/lib/apache2/mod_dav_svn.so
 LoadModule authz_svn_module /usr/lib/apache2/mod_authz_svn.so
 
-<VirtualHost 127.0.0.1:8000>
-    <Location />
+<Location />
     DAV svn
     SVNParentPath /data
     SVNListParentPath On
@@ -15,5 +14,4 @@ LoadModule authz_svn_module /usr/lib/apache2/mod_authz_svn.so
     AuthUserFile /data/.htpasswd
     AuthzSVNAccessFile /data/authz
     Require valid-user
-    </Location>
-</VirtualHost>
+</Location>