apt search pdfunite
poppler-utils/stable,stable,now 25.03.0-5 amd64 [installed,automatic]
PDF utilities (based on Poppler)

# tested on
hostnamectl
Operating System: Debian GNU/Linux 13 (trixie) 
Kernel: Linux 6.12.48+deb13-amd64
Architecture: x86-64

# worked nicely
pdfunite file1.pdf file2.pdf file3.pdf output.pdf

# untested
gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -sOutputFile=output.pdf file1.pdf file2.pdf file3.pdf
pdftk file1.pdf file2.pdf cat output output.pdf

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