Add support for workflow_dispatch event

[andykenward]

Related to #240

This pull request adds unit tests for handling the workflow_dispatch event in GitHub Actions workflows.

• Adds unit tests: Implements two tests in a new file __tests__/common/github/workflow-event/workflow-event.test.ts. The first test verifies that the workflow_dispatch event is correctly processed, ensuring the event name and payload are as expected. The second test checks that deployment creation is triggered for workflow_dispatch events, simulating the deployment creation logic and asserting that it is called with the event payload.
• Environment setup: Includes a setup step to stub environment variables specific to the workflow_dispatch event, ensuring the tests run under the correct conditions.

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Latest commit: 8d4a5bd

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[github-actions]

Cloudflare Pages Deployment

Environment: preview
Project: cloudflare-pages-action
Built with commit: b2707df
Preview URL: https://a286f4d9.cloudflare-pages-action-a5z.pages.dev
Branch Preview URL: https://workflow-dispatch-support.cloudflare-pages-action-a5z.pages.dev

Wrangler Output

Uploading... (3/3)
✨ Success! Uploaded 0 files (3 already uploaded) (0.67 sec)

✨ Uploading _headers
✨ Uploading Functions bundle
✨ Deployment complete! Take a peek over at https://a286f4d9.cloudflare-pages-action-a5z.pages.dev

[github-actions]

Cloudflare Pages Deployment

Environment: preview
Project: cloudflare-pages-action
Built with commit: c99727e
Preview URL: https://5229d85e.cloudflare-pages-action-a5z.pages.dev
Branch Preview URL: https://workflow-dispatch-support.cloudflare-pages-action-a5z.pages.dev

Wrangler Output

Uploading... (3/3)
✨ Success! Uploaded 0 files (3 already uploaded) (0.58 sec)

✨ Uploading _headers
✨ Uploading Functions bundle
✨ Deployment complete! Take a peek over at https://5229d85e.cloudflare-pages-action-a5z.pages.dev