branch-update-repo: simplify conditions to update the default release in ci-flatdeb-builder

Signed-off-by: Dylan Aïssi <dylan.aissi@collabora.com>

release-scripts/branch-update-repo

@@ -77,11 +77,7 @@ update-repo-infrastructure-infrastructure(){
 }
 
 update-repo-ci-flatdeb-builder(){
-    # Only update if the current release's major version is older than or equal to
-    # the major version of the new release.
-    current_release_major=$(grep -Po 'APERTIS_RELEASE_DEFAULT:\s+\Kv(\d{4})' ci-flatdeb-builder.yaml)
-    if ! grep -Eq "APERTIS_RELEASE_DEFAULT: ${NEXT_RELEASE}\b" ci-flatdeb-builder.yaml \
-        && [ "$current_release_major" \< "$NEXT_RELEASE" ] || [ "$current_release_major" = "$NEXT_RELEASE"* ]
+    if [ -f ci-flatdeb-builder.yaml ] && ! grep -q -w "APERTIS_RELEASE_DEFAULT: ${NEXT_RELEASE}" ci-flatdeb-builder.yaml
     then
         sed -i "s/APERTIS_RELEASE_DEFAULT: .*/APERTIS_RELEASE_DEFAULT: ${NEXT_RELEASE}/" ci-flatdeb-builder.yaml
         git add ci-flatdeb-builder.yaml
@@ -312,4 +308,4 @@ branch)
 *)
     echo Invalid command
     exit 1
-esac
\ No newline at end of file
+esac