Add support for BPMN diagrams

[gautaz]

Hello,

Looking at the documentation, it seems that BPMN diagrams are supported by asciidoctor-pdf.

However, when trying to generate a PDF file from an asciidoc file containing a BPMN diagram, the container issues the following error:

asciidoctor: ERROR: diagrams/test.bpmn: line 0: Failed to generate image: Could not find the 'bpmn-js' executable in PATH; add it to the PATH or specify its location using the 'bpmn-js' document attribute

[gautaz]

I've managed to get a little further by using -r asciidoctor-kroki instead of -r asciidoctor-diagram but it fails with the following warning:

asciidoctor: WARNING: could not retrieve remote image: https://kroki.io/bpmn/svg/<...very long...> 414 URI Too Long

I guess the diagram sources are too long (BPMN = XML) to be passed as a URI.

[barthel]

I'm building a full blown Asciidoctor Container Image with all Asciidoctor Diagrams extensions. BPMS is already implemented. Give it a try.

Github: https://github.com/barthel/docker-asciidoctor Docker Hub: https://hub.docker.com/r/uwebarthel/asciidoctor

[gautaz]

Spring cleaning time! There is no need to keep this issue anymore, feel free to reopen a new one if needed.