Install chromium in base image

Replace google-chrome with it, it has problems with webdrivers
(DevToolsActivePort file doesn't exist) and we like to use open source
anyway...

We also do not need phantomjs anymore since a long time.

Dockerfile.base

@@ -1,15 +1,5 @@
 FROM opensuse/leap:15
 
-# Import google packaging key for chrome
-COPY google-packaging.key /tmp
-RUN rpm --import /tmp/google-packaging.key
-
-# Enable/Disable the repositories we need/don't need
-RUN zypper rr openSUSE-Leap-15.0-Non-Oss openSUSE-Leap-15.0-Update-Non-Oss; \
-    zypper ar -f https://download.opensuse.org/repositories/devel:/tools/openSUSE_Leap_15.0/devel:tools.repo; \
-    zypper ar -f http://dl.google.com/linux/chrome/rpm/stable/x86_64 google-chrome; \
-    zypper --gpg-auto-import-keys refresh
-
 # Install our requirements
 RUN zypper -n install --no-recommends \
     # for compiling assets/gems
@@ -23,13 +13,11 @@ RUN zypper -n install --no-recommends \
     # for nokogiri
     libxml2-devel libxslt-devel \
     # for the interactive shell
-    ack curl wget w3m vim \
-    # for running our tests
-    phantomjs which \
+    ack curl wget w3m vim which \
     # as ruby
     ruby2.5-devel \
     # as browser for feature tests
-    google-chrome-stable
+    chromium
 
 # Setup sudo
 RUN echo 'osem ALL=(ALL) NOPASSWD: ALL' >> /etc/sudoers