Update args to clear sideload directory before cloning

because data is now persisted between restarts we need to clear the directory contents before cloning to avoid 'already exists and is not an empty directory' errors.

dev/helm/templates/deployment.yaml

@@ -34,7 +34,7 @@ spec:
           env:
             {{- toYaml .Values.sideload.env | nindent 12 }}
           command: [ "sh", "-c" ]
-          args: [ "mkdir -p /wiki/data/sideload && git clone --depth=1 {{ .Values.sideload.repoURL }} /wiki/data/sideload/" ]
+          args: [ "mkdir -p /wiki/data/sideload && rm -fr /wiki/data/sideload/* && git clone --depth=1 {{ .Values.sideload.repoURL }} /wiki/data/sideload/" ]
           resources:
             {{- toYaml .Values.sideload.resources | nindent 12 }}
           {{- with .Values.volumeMounts }}