Tests: Force epel8 to install chromium

Currently epel repo configs are using releasever which is set to 9.
This is causing dnf failures looking for a repo which doesn't exist.
We need to force releasever to 8 in order to install chromium needed for
the gating tests.

Resolves: rhbz#1984553

tests/browser.sh

@@ -20,8 +20,11 @@ if ! rpm -q chromium; then
     if grep -q 'ID=.*rhel' /etc/os-release; then
         dnf install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
         dnf config-manager --enable epel
+        # Force epel to 8 since epel 9 does not exist yet
+        sed -i 's/$releasever/8/g' /etc/yum.repos.d/epel*
     fi
     dnf install -y chromium
+    dnf remove epel-release
 fi
 
 # install cockpit-packagekit for testAppMenu