create-repos: ignore "Repository already exists"

Inexplicably, for some task repos, quay.io returns 401 in response to
the initial request but then returns "Repository already exists" when we
try to create the repo.

Ignore these errors.

Example:

    Checking konflux-ci/tekton-catalog/task-fips-operator-bundle-check, http code: 401
    Missing task bundle repo: tekton-catalog/task-fips-operator-bundle-check in konflux-ci, creating...
      % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                     Dload  Upload   Total   Spent    Left  Speed
    100   362  100   218  100   144    323    213 --:--:-- --:--:-- --:--:--   537
    WARNING: repository creation failed, but the error message was 'Repository already exists'. Assuming that's fine.

Signed-off-by: Adam Cmiel <acmiel@redhat.com>

.tekton/scripts/create-task-pipeline-bundle-repos.sh

@@ -47,13 +47,15 @@ locate_in_all_namespaces() {
                 --arg description "" \
                 '$ARGS.named'
             )
-            if ! err_msg=$(curl --oauth2-bearer "${QUAY_TOKEN}" "https://quay.io/api/v1/repository" --data-binary "$payload" -H "Content-Type: application/json" -H "Accept: application/json" | jq '.error_message // empty');
+            if ! err_msg=$(curl --oauth2-bearer "${QUAY_TOKEN}" "https://quay.io/api/v1/repository" --data-binary "$payload" -H "Content-Type: application/json" -H "Accept: application/json" | jq -r '.error_message // empty');
             then
               echo "curl returned an error when creating the repository. See the error above."
               exit 1
             fi
 
-            if [ -n "$err_msg" ]; then
+            if [[ "$err_msg" == "Repository already exists" ]]; then
+                echo "WARNING: repository creation failed, but the error message was '$err_msg'. Assuming that's fine."
+            elif [[ -n "$err_msg" ]]; then
                 echo "Quay returned an error when creating the repository: ${err_msg}"
                 exit 1
             fi