Fix generate-docker-image-tags API calls

[michaelvu97]

Discovered while using this action without a shortcut token:

Run XanaduAI/cloud-actions/[email protected]
Run if [ "$GITHUB_EVENT_NAME" == "pull_request" ]
Branch is 'ci'.
SHA is '70ea076'.
Run SHA="70ea076"
  
gh: Resource not accessible by integration (HTTP 403)
jq: error (at <stdin>:0): Cannot index string with string "number"

Changes

• Only execute get-pr-number if a shortcut token exists

Approved too quickly.

[Mandrenkov]

The solution proposed in this PR works albeit in an indirect way.

From what I can tell, the issue in the PR description doesn't have anything to do with Shortcut. The error seems to be a permission issue with the GitHub token that is used while running the action. Disabling this step if no Shortcut API token is present is still a reasonable thing to do though since the output of the step is only consumed downstream when a Shortcut API token is provided.

So, while the implementation here may work in the current case, the same issue might crop up again when a Shortcut API token is provided.

[michaelvu97]

So, while the implementation here may work in the current case, the same issue might crop up again when a Shortcut API token is provided.

Yep makes sense! I ran into this because I didn't want to configure any additional github token settings to be able to get tags. If the shortcut functionality is desired, the token would need to be setup correctly.