Avoid the "spare machine that increases app availability"

It is not possible to deploy with it without payment: https://community.fly.io/t/no-machines-in-group-app-launching-one-new-machine-error-error-creating-a-new-machine-failed-to-launch-vm-to-create-more-than-1-machine-per-app-please-add-a-payment-method/12592/2

Can not control this from the config file:
* https://community.fly.io/t/allow-scale-region-list-vm-size-etc-in-fly-toml/2843
* https://community.fly.io/t/config-scale-in-fly-toml/12559

Sounds like it only affects the initial deploy.

action.yml

@@ -54,6 +54,7 @@ runs:
       shell: bash
       run: |
         flyctl deploy --remote-only \
+          --ha=false \
           --env RELEASE_COMMIT=$(git rev-parse --verify HEAD) \
           --env RELEASE_CREATED_AT=$(date --iso-8601=seconds) \
           --env RELEASE_VERSION="v$(( $FLY_RELEASE_VERSION + 1 ))"