Make helm publish use relative URLs

Add the --relative flag. This makes the url set in the index.yaml
use relative urls instead of s3://chart.timescale.com/* which doesn't
work since the charts are accessed using https.

.github/workflows/helm.yml

@@ -83,12 +83,12 @@ jobs:
             helm package deploy/helm-chart -d chart_release/
             helm plugin install https://github.com/hypnoglow/helm-s3.git          
             helm repo add tscharts s3://charts.timescale.com
-            helm s3 push chart_release/* tscharts --acl public-read --dry-run 
+            helm s3 push chart_release/* tscharts --acl public-read --relative --dry-run
 
       - name: push package
         env:
           AWS_REGION: 'us-east-1'
           AWS_ACCESS_KEY_ID: ${{ secrets.ORG_AWS_HELM_CHART_BUCKET_ACCESS_KEY_ID }}
           AWS_SECRET_ACCESS_KEY: ${{ secrets.ORG_AWS_HELM_CHART_BUCKET_SECRET_ACCESS_KEY }}
         run: |
-          helm s3 push chart_release/* tscharts --acl public-read
+          helm s3 push chart_release/* tscharts --acl public-read --relative