enable crb repo

plans/tier1.fmf

@@ -6,6 +6,14 @@
     url: "https://src.fedoraproject.org/tests/python-pyudev.git"
   execute:
     how: tmt
+  prepare:
+    - how: shell
+      script: |
+        ENABLE_REPO_CMD="yum-config-manager --enable"
+        if command -v dnf >/dev/null 2>&1; then
+          ENABLE_REPO_CMD="dnf config-manager --set-enabled"
+        fi
+        ${ENABLE_REPO_CMD} rhel-CRB-latest
 
 /internal:
   summary: Internal Tier1 tests