mergify: support backport-active-branches and backport-active-minors

.mergify.yml

@@ -176,6 +176,8 @@ pull_request_rules:
           * `backport-8./d` is the label to automatically backport to the `8./d` branch. `/d` is the digit.
           * `backport-9./d` is the label to automatically backport to the `9./d` branch. `/d` is the digit.
           * `backport-8.x` is the label to automatically backport to the `8.x` branch.
+          * `backport-active-branches` is the label to automatically backport to all active branches
+          * `backport-active-minors` is the label to automatically backport to all active minor branches
 
   - name: remove backport-skip label
     conditions:
@@ -434,3 +436,44 @@ pull_request_rules:
         labels:
           - "backport"
         title: "[{{ destination_branch }}] {{ title }} (backport #{{ number }})"
+
+  - name: backport patches to all active minor branches
+    conditions:
+      - merged
+      - base=main
+      - label=backport-active-minors
+    actions:
+      backport:
+        assignees:
+          - "{{ author }}"
+        # NOTE: this list needs to be changed when a new minor branch is created
+        #       or an existing minor branch reached EOL.
+        branches:
+          - "9.0"
+          - "8.18"
+          - "8.17"
+          - "8.16"
+        labels:
+          - "backport"
+        title: "[{{ destination_branch }}](backport #{{ number }}) {{ title }}"
+  - name: backport patches to all active branches
+    conditions:
+      - merged
+      - base=main
+      - label=backport-active-branches
+    actions:
+      backport:
+        assignees:
+          - "{{ author }}"
+        # NOTE: this list needs to be changed when a new minor branch is created
+        #       or an existing release branch reached EOL.
+        branches:
+          - "9.0"
+          - "8.18"
+          - "8.17"
+          - "8.16"
+          - "8.x"
+          - "7.17"
+        labels:
+          - "backport"
+        title: "[{{ destination_branch }}](backport #{{ number }}) {{ title }}"