Bug 2171154

Sorry, this one was empty due to ~~bugzilla~~.

On my newly installed F37 IoT the script `01_update_platforms_check.sh` always fails. This is due to UPDATE_PLATFORM_URLS being treated as an array when it's not made to be one. This patch fixes this (but I couldn't find where to submit it):

```
--- 01_update_platforms_check.orig.sh	2023-02-18 11:42:51.542118526 +0000
+++ 01_update_platforms_check.sh	2023-02-18 11:35:51.707036576 +0000
@@ -5,7 +5,7 @@
 URLS_WITH_PROBLEMS=()

 get_update_platform_urls() {
-    UPDATE_PLATFORM_URLS=$(grep -P -ho 'http[s]?.*' $REPOS_DIRECTORY/*)
+    mapfile -t UPDATE_PLATFORM_URLS < <(grep -P -ho 'http[s]?.*' $REPOS_DIRECTORY/*)
     if [[ -z $UPDATE_PLATFORM_URLS ]]; then
         echo "No update platforms found, this can be a mistake"
         exit 1
```

The output (with set +ex) of the original file shows where things go wrong:

```
[root@zmeya ~]# ./01_update_platforms_check.orig.sh
+ REPOS_DIRECTORY=/etc/ostree/remotes.d
+ URLS_WITH_PROBLEMS=()
+ [[ ! -d /etc/ostree/remotes.d ]]
+ get_update_platform_urls
++ grep -P -ho 'http[s]?.*' /etc/ostree/remotes.d/fedora-iot.conf
+ UPDATE_PLATFORM_URLS='https://ostree.fedoraproject.org/iot
https://ostree.fedoraproject.org/iot/mirrorlist'
+ [[ -z https://ostree.fedoraproject.org/iot
https://ostree.fedoraproject.org/iot/mirrorlist ]]
+ assert_update_platforms_are_responding
+ for UPDATE_PLATFORM_URL in "${UPDATE_PLATFORM_URLS[@]}"
++ curl -o /dev/null -Isw '%{http_code}\n' 'https://ostree.fedoraproject.org/iot
https://ostree.fedoraproject.org/iot/mirrorlist'
++ echo Unreachable
+ HTTP_STATUS='000
Unreachable'
+ [[ 000
Unreachable == 2* ]]
+ [[ 000
Unreachable == 3* ]]
+ URLS_WITH_PROBLEMS+=("$UPDATE_PLATFORM_URL")
+ [[ 1 -eq 0 ]]
+ echo 'There are problems connecting with the following URLs:'
There are problems connecting with the following URLs:
+ echo 'https://ostree.fedoraproject.org/iot
https://ostree.fedoraproject.org/iot/mirrorlist'
https://ostree.fedoraproject.org/iot
https://ostree.fedoraproject.org/iot/mirrorlist
+ exit 1
```