GHA: Add workflow for building and publishing packages. #6

Job	Run time
Build RPM / Build	1m 59s
Build DEB (bullseye, amd64) / Build	42s
Build DEB (bookworm, armhf) / Build	5m 4s
Build DEB (bookworm, amd64) / Build	52s
Build DEB (bullseye, armhf) / Build	5m 27s
Build DEB (buster, amd64) / Build	57s
Build DEB (buster, armhf) / Build	5m 24s
Build DEB (stretch, amd64) / Build	47s
Build DEB (stretch, armhf) / Build	5m 8s
Meta RPM	0s
Copy to remote RPM	0s
Copy meta to remote RPM	0s
Copy hash to remote RPM	0s
Meta DEB	0s
Copy to remote DEB	0s
Copy meta to remote DEB	0s
Copy hash to remote DEB	0s
	26m 20s

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