🎁 Adds symlink between samvera and hyrax-webapp branding directories

The issue of branding, logo, and thumbnails not appearing has been solved before in other projects.
ref:
- scientist-softserv/atla-hyku#187

This commit is required to resolve the issue with uploading images from the Collections' branding tab. Because the symlink wasn't established, a user would not be able to see the images they uploaded even though the path correctly exists.

Dockerfile

@@ -83,6 +83,11 @@ RUN ln -sf /usr/lib/libmediainfo.so.0 /app/fits/tools/mediainfo/linux/libmediain
 
 COPY --chown=1001:101 ./bin/db-migrate-seed.sh /app/samvera/
 
+# Ensure the directory exists and create the symbolic link
+RUN mkdir -p /app/samvera/hyrax-webapp/public && \
+ mkdir -p /app/samvera/branding && \
+ ln -snf /app/samvera/branding /app/samvera/hyrax-webapp/public/branding
+
 ONBUILD ARG APP_PATH=.
 ONBUILD COPY --chown=1001:101 $APP_PATH/Gemfile* /app/samvera/hyrax-webapp/
 ONBUILD RUN git config --global --add safe.directory /app/samvera && \