fix: RHDHBUGS-2752: --extra-files flag for prepare-restricted-environment.sh broken (#2423)

* fix: RHDHBUGS-2752: --extra-files flag for prepare-restricted-environment.sh broken

the indentation for the additionalImages stanza of the ImageSetConfiguration passed into oc-mirrors was incorrect, leading to oc-mirror erroring out

* armel-1

---------

Co-authored-by: Armel Soro <asoro@redhat.com>

Author: gabemontero

.rhdh/scripts/prepare-restricted-environment.sh

@@ -914,11 +914,11 @@ EOF
     nbExtraImgs=${#EXTRA_IMAGES[@]}
     if [ "$nbExtraImgs" -ge 1 ]; then
       cat <<EOF >>"${TMPDIR}/imageset-config.yaml"
-      additionalImages:
+  additionalImages:
 EOF
       for extraImg in "${EXTRA_IMAGES[@]}"; do
         cat <<EOF >>"${TMPDIR}/imageset-config.yaml"
-      - name: "$extraImg"
+  - name: "$extraImg"
 EOF
       done
     fi