GHA: Add workflow for building and publishing packages. #17

Job	Run time
Build RPM / Build	2m 10s
Build DEB (bookworm, amd64) / Build	46s
Build DEB (bullseye, amd64) / Build	45s
Build DEB (bookworm, armhf) / Build	5m 13s
Build DEB (bullseye, armhf) / Build	5m 16s
Build DEB (buster, armhf) / Build	5m 23s
Build DEB (buster, amd64) / Build	49s
Build DEB (stretch, armhf) / Build	5m 4s
Build DEB (stretch, amd64) / Build	41s
Copy to remote RPM	0s
Meta 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 7s

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