Update .drone.yml to enable clearing originally-checked-out dir

.drone.yml

@@ -23,6 +23,9 @@ steps:
         #
         # https://github.com/go-gitea/gitea/issues/28973#issuecomment-1961859655
         # Some parameters are necessary in order to make the push to gitea succeed
+        #
+        # Another reference:
+        # https://github.com/thegeeklab/drone-docker-buildx/issues/47
         - "type=registry,ref=gitea.scubbo.org/${DRONE_REPO}:${DRONE_BRANCH},mode=max,image-manifest=true,oci-mediatypes=true"
       registry: gitea.scubbo.org
       username: scubbo
@@ -36,11 +39,24 @@ steps:
       platforms:
         - linux/arm64
         - linux/amd64
+  # Because `drone/git` does not support checking out to a specified directory
+  # (https://github.com/drone/drone-git/blob/master/posix/clone-commit), we have to remove the current contents of the
+  # directory before cloning the Helm Chart repo or there will be a clash.
+  #
+  # ...God, I really need to transition off of Drone and onto a better CI tool...
+  - name: Clear directory
+    image: alpine
+    commands:
+      - rm -rf *
+      # Shouldn't need to specify this, but just in case
+      - rm -rf .git
+
   - name: Checkout Helm Chart
     image: drone/git
     settings:
       remote: gitea.scubbo.org/scubbo/helm-charts
       ref: refs/heads/main
+
   - name: Update Helm Chart
     image: alpine
     commands: