Clean up GH actions code

Update self executed container to ensure
we run with latest set of packages

Signed-off-by: Dinesh Prasanth M K <dmoluguw@redhat.com>

.github/workflows/required-tests.yml

@@ -4,7 +4,6 @@ on:
     push:
         branches:
             - master
-            - gh-actions
     pull_request:
         branches:
             - master

travis/runner-init.sh

@@ -38,3 +38,11 @@ docker run \
 
 # Check whether the container is up
 docker ps -a
+
+# Pause 5 seconds to let the container start up.
+# The container uses /usr/sbin/init as its entrypoint which requires few seconds.
+# to startup. This avoids the following error:
+# [Errno 2] No such file or directory: '/var/cache/dnf/metadata_lock.pid'
+sleep 5
+
+docker exec -i ${CONTAINER} dnf update -y