Fix script to get next eksa version (#7632)

Just before we release a new minor version, we cut a release branch that
we use to run tests and stabilize the release. At this point, there
isn't yet any tag for the minor release. The old code was assuming there
was one at thus picking the wrong tag. This solves the issue by running
the same logic as for main where there are no tags that match the
release branch minor version.

scripts/eksa_version.sh

@@ -68,10 +68,16 @@ function eksa-version::get_next_eksa_version_for_ancestor() {
 
         release_version=$(echo "${latest_tag}" | awk -F. -v OFS=. '{$2++; $3=0; print}')
     else
-        # For release branhc, get the latest tag that matches current commit
-        # and bump the patch version
-        latest_tag=$(git describe --tags --abbrev=0)
-        release_version=$(echo "${latest_tag}" | awk -F. -v OFS=. '{$3++; print}')
+        # For a release branch, get the latest tag for the release minor version and bump the patch version
+        # If there is not tag yet, use latest tag by date but bumping the minor version and using 0 as the patch
+        # Silence stdeer as the command will fail if there are no tags
+        latest_tag=$(git describe --tags --match "v$(echo "$ancestor_branch" | sed 's/release-//').*" "$(git rev-list --tags --max-count=1)" 2>/dev/null)
+        if [[ -z "$latest_tag" ]]; then
+            latest_tag=$(git describe --tags "$(git rev-list --tags --max-count=1)")
+            release_version=$(echo "${latest_tag}" | awk -F. -v OFS=. '{$2++; $3=0; print}')
+        else
+            release_version=$(echo "${latest_tag}" | awk -F. -v OFS=. '{$3++; print}')
+        fi
     fi
 
     echo "$release_version"