Do not run set-env-variables.sh

Do not run `set-env-variables.sh` to set ARCH and OS variables
to avoid the CI failing because of shellcheck lint problems.

Signed-off-by: Miguel Martín <mmartinv@redhat.com>

test/cases/ostree-raw-image.sh

@@ -1,15 +1,15 @@
 #!/bin/bash
 set -euo pipefail
 
+# Get OS data.
+source /etc/os-release
+ARCH=$(uname -m)
+
 # Provision the software under test.
 /usr/libexec/osbuild-composer-test/provision.sh none
 
 source /usr/libexec/tests/osbuild-composer/shared_lib.sh
 
-# Get OS data.
-source /etc/os-release
-ARCH=$(uname -m)
-
 # workaround for bug https://bugzilla.redhat.com/show_bug.cgi?id=2213660
 if [[ "$VERSION_ID" == "9.3"  || "$VERSION_ID" == "9" ]]; then
     sudo tee /etc/sysconfig/libvirtd << EOF > /dev/null