anchoring instead to fix linter problems

.woodpecker.yml

@@ -1,14 +1,9 @@
-x-defaults: &defaults
-  image: alpine
-  volumes:
-    - "/Users/jthor/Obsidian/My Vault:/obsidian"
-    - "/Volumes/What/backup:/backup"
-x-backup-cmd: &backup-cmd
-  - tar czf /backup/obsidian-$(date +%F).tar.gz /obsidian
-
 steps:
-  sanity-check:
-    <<: *defaults
+  sanity-check: &defaults
+    image: alpine
+    volumes: &vols
+      - "/Users/jthor/Obsidian/My Vault:/obsidian"
+      - "/Volumes/What/backup:/backup"
     commands:
       - echo "Listing mount points..."
       - ls -ld /obsidian /backup
@@ -16,12 +11,15 @@ steps:
 
   backup-on-push:
     <<: *defaults
-    commands: *backup-cmd
+    volumes: *vols
+    commands: &backup-cmd
+      - tar czf /backup/obsidian-$(date +%F).tar.gz /obsidian
     when:
       event: [ push, manual ]
 
   backup-on-cron:
     <<: *defaults
+    volumes: *vols
     commands: *backup-cmd
     when:
       event: [ cron ]