Add Width and Height as JSON Inputs for PDF Export

[nelsontr]

Hey @arthur-mdn! Great repository—really helpful!

Would you be able to add some modifications to enable exporting multiple PDFs with varying aspect ratios?

One approach could be adding width and height fields as parameters in the curl request to the service. This would ensure more consistent PDF customization across different Grafana versions, allowing for identical PDF output regardless of the Grafana version in use.

In our case, we have multiple dashboards developed by different team members, each with unique aspect ratios. These settings would be invaluable for exporting accurate, tailored reports across our diverse dashboard collection.
Here’s an example of how it might look:

curl \
  -H "Content-Type: application/json" \
  -X POST \
  -d '{ 
    "url": "http://your-grafana-server/d/your-dashboard-id?orgId=1&kiosk",
    "width": "1200px",
    "height": "4000px"
  }' \
  http://localhost:3001/generate-pdf

Adding these parameters would likely override the autoHeight feature in the script, making it more versatile for different aspect ratios.