ENH Handle CMS 6 branches

action.yml

@@ -21,8 +21,8 @@ runs:
           date_part=$(date +%H)
         fi
         if (( $date_part % 2 == 1 )); then
-          # latest major, next-minor e.g. "5"
-          type=latest,next-minor
+          # current major, next-minor e.g. "5"
+          type=current,next-minor
         else
           # previous major, next-patch e.g. "4.13"
           type=previous,next-patch
@@ -53,18 +53,28 @@ runs:
         major_branches=$(jq -r '.[] | select(.name | test("^[0-9]+$")) | .name' __branches.json | sort -V -r)
         # "major_branches" needs to be quoted to preserve line-breaks
         major_branches_count=$(echo "$major_branches" | wc -l)
-        if [[ $major_type == "latest" ]]; then
+        if [[ $major_type == "current" ]]; then
             if (( $major_branches_count < 1 )); then
                 echo "No major branches found"
                 exit 1
             fi
             major_branch=$(echo "$major_branches" | head -1)
+            if (( $major_branches_count >= 2 )); then
+              # There are currently CMS 6 dev branches e.g. 6.x-dev, but no CMS 6 releases yet
+              # Assume that the 2nd major branch is the current major branch
+              major_branch=$(echo "$major_branches" | head -2)
+            fi
         elif [[ $major_type == "previous" ]]; then
             if (( $major_branches_count < 2 )); then
                 echo "Only one major branch found, not running CI on this cycle - will run on next cycle"
                 exit 0
             fi
             major_branch=$(echo "$major_branches" | head -2 | tail -1)
+            if (( $major_branches_count >= 2 )); then
+              # There are currently CMS 6 dev branches e.g. 6.x-dev, but no CMS 6 releases yet
+              # Assume that the 3rd major branch is the previous major branch
+              major_branch=$(echo "$major_branches" | head -3 | tail -1))
+            fi
         fi
         if [[ $minor_type == "next-patch" ]]; then
             # not escaping rx . as \. because jq will say it is a compile error