Fix broken chef/berkshelf install in docker images

Set a specific version for the ruby gem "public_suffix", required by chef/berkshelf,
to be compatible with the used version of ruby (2.5.0).

Signed-off-by: Vasyl Razinkov <vasyl.razinkov@est.tech>
Change-Id: I963a60206cb1f22296fcb5a9f763f326f629f077
Issue-ID: SDC-4139
diff --git a/catalog-fe/sdc-frontend/Dockerfile b/catalog-fe/sdc-frontend/Dockerfile
index a860623..6f62db4 100644
--- a/catalog-fe/sdc-frontend/Dockerfile
+++ b/catalog-fe/sdc-frontend/Dockerfile
@@ -12,6 +12,7 @@
         ruby-dev \
         libffi-dev \
         libxml2-dev && \
+    gem install public_suffix -v 4.0.7 --no-document && \
     gem install multipart-post -v 2.2.0 --no-document && \
     gem install chef:13.8.5 berkshelf:6.3.1 io-console:0.4.6 etc webrick --no-document && \
     gem cleanup && \