[Solved] Insert external pdf page(s) with unknown number of pages with LuaLaTeX

Bjo Asks: Insert external pdf page(s) with unknown number of pages with LuaLaTeX
I am going to stitch together several external PDF files. Some are single paged and others are multi paged. Is there a general way of including external PDFs independent on the number of pages. I was thinking of a code like the one beneath.

Thanks for any suggestions

Code:
documentclass[a4paper]{article}
usepackage{pdfpages}
begin{document}

%if doc1.pdf is single paged, do:

includepdf[offset=0mm -16mm,  scale=0.86, pages=1,pagecommand={section{Headding}}]{doc1.pdf}

%if doc.pdf is multi page, do:

includepdf[offset=0mm -16mm,  scale=0.86, pages=1,pagecommand={section{Headding}}]{doc1.pdf} 
 %frame
includepdf[offset=0mm -5mm,  scale=0.95, pages=2-,pagecommand={}]{doc1.pdf}

%above code repeated for 7 pdf's

end{document}

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