Use bigboot_size_target instead of the calculated size diff

bigboot-wip.yml

@@ -0,0 +1,27 @@
+---
+- name: Perform logical volume and boot parition resizing as needed
+  hosts: all
+  become: true
+  gather_facts: true
+  strategy: free
+
+  vars_files:
+    - bigboot_vars.yml
+
+  tasks:
+    - name: Cleanup from any previous executions
+      ansible.builtin.import_tasks: tasks/cleanup.yml
+
+    - name: Shrink the logical volume to support /boot expansion
+      ansible.builtin.import_role:
+        name: infra.lvm_snapshots.shrink_lv
+      vars:
+        shrink_lv_devices:
+          - device: "/dev/mapper/system-root"
+            size: "53687091200"
+
+    - name: Expand the /boot partition as requested
+      ansible.builtin.import_role:
+        name: infra.lvm_snapshots.bigboot
+      vars:
+        bigboot_partition_size: "{{ bigboot_size_target }}"

bigboot_execute_resize.yml

@@ -35,7 +35,7 @@
       ansible.builtin.import_role:
         name: infra.lvm_snapshots.bigboot
       vars:
-        bigboot_partition_size: "{{ bigboot_data[inventory_hostname]['bigboot_size'] }}"
+        bigboot_partition_size: "{{ bigboot_size_target }}"
       when:
         - bigboot_data[inventory_hostname]['bigboot_execute_bigboot'] | bool