Reference model for getting started tutorial fails to deploy

[pinkertonpg]

Description

This finished workflow model linked to in the Getting Started Tutorial does not deploy on Zeebe 0.23.1: https://github.com/zeebe-io/zeebe/blob/0.23.1/docs/src/getting-started/img/order-process.bpmn

Attempting to deploy it gives me two errors, referencing missing '='.

$ zbctl --insecure deploy order-process.bpmn 
Error: rpc error: code = InvalidArgument desc = Command rejected with code 'CREATE': Expected to deploy new resources, but encountered the following errors:
'order-process.bpmn': - Element: Message_155nrcd > extensionElements > subscription
    - ERROR: Expected expression but found static value 'orderId'. An expression must start with '=' (e.g. '=orderId').
- Element: SequenceFlow_1girnrf > conditionExpression
    - ERROR: Expected expression but found static value 'orderValue>=100'. An expression must start with '=' (e.g. '=orderValue>=100').

Environment
I have Zeebe cluster and operate running in a Kubernetes cluster, using the helm charts.

zbctl status

``` $ zbctl --insecure status Cluster size: 3 Partitions count: 3 Replication factor: 3 Gateway version: 0.23.1 Brokers: Broker 0 - master-zeebe-0.master-zeebe.pgp-zeebe.svc.cluster.local:26501 Version: 0.23.1 Partition 1 : Leader Partition 2 : Follower Partition 3 : Follower Broker 1 - master-zeebe-1.master-zeebe.pgp-zeebe.svc.cluster.local:26501 Version: 0.23.1 Partition 1 : Follower Partition 2 : Leader Partition 3 : Follower Broker 2 - master-zeebe-2.master-zeebe.pgp-zeebe.svc.cluster.local:26501 Version: 0.23.1 Partition 1 : Follower Partition 2 : Follower Partition 3 : Leader ```

Possible fix?
Disclaimer, I'm just an infrastructure person trying to set up and test out Zeebe, I know nothing of BPMN so this might not be an appropriate fix.

I was able to get this to deploy properly by changing the two references to orderID and orderValue in the .bpmn to =orderID and =orderValue. It then deployed successfully and I was able to view the workflow in Operate. If it's that simple I'm happy to open a PR, but would want some confirmation that it's a valid fix first.

[saig0]

Hi @pinkertonpg 👋

Thank you for reporting this! You're right that the equal signs = are missing in the BPMN workflow.
Looking forward to see your PR 👍