move varibles to relevant task

Taskfile.yml

@@ -4,21 +4,21 @@
 
 version: '3'
 
-vars:
+tasks:
+
+  release:
+    desc: Create and publish an new release
+    vars:
       RELEASE:
         sh: svu next
       BRANCH:
         sh: git branch --show-current
       COMMIT:
         sh: git rev-parse --short --verify {{.BRANCH}}
-
-tasks:
-
-  release:
-    desc: Create and publish an new release
-    prompt: Create new release {{.RELEASE}} from {{.COMMIT}}@{{.BRANCH}}?
     preconditions:
       - sh: test "{{.BRANCH}}" == "main"
+        msg: "You must be on the main branch to release"
+    prompt: Create new release {{.RELEASE}} from {{.COMMIT}}@{{.BRANCH}}?
     cmds:
       - git tag {{.RELEASE}}
       - git push