Tweak to caching

.drone.yml

@@ -14,6 +14,10 @@ steps:
     settings:
       cache_from:
         - "type=registry\\\\,ref=gitea.scubbo.org/${DRONE_REPO}:${DRONE_BRANCH}"
+      cache_to:
+        # https://docs.docker.com/build/cache/backends/registry/
+        # `mode=max` necessary in order to cache intermediate stages
+        - "type=registry,ref=gitea.scubbo.org/${DRONE_REPO}:${DRONE_BRANCH},mode=max"
       registry: gitea.scubbo.org
       username: scubbo
       password:
@@ -30,6 +34,7 @@ steps:
     image: drone/git
     settings:
       remote: gitea.scubbo.org/scubbo/helm-charts
+      ref: refs/heads/main
   - name: Update Helm Chart
     image: alpine
     commands: