gha: build: linux: rework into matrix; use bookworm for .deb builds#59

SuperKali merged 3 commits intoarmbian:mainarmbian/imager:mainfrom

rpardini:pr/gha-build-linux-rework-into-matrix-use-bookworm-for-deb-buildsrpardini/armbian-imager:pr/gha-build-linux-rework-into-matrix-use-bookworm-for-deb-buildsCopy head branch name to clipboard