ci(release): add multiplatform releases

[juju4]

This is a quick attempt to have releases for multiple platforms/architecture and sha256 files.

mostly failing at ncipollo/release-action as no ref tag in my tests (to restore tags when PR is good)
except macos amd64 and linux arm64

Run env GOOS=darwin GOARCH=amd64 go build -ldflags='-s -w' -trimpath -o release/sigtop-darwin-amd64
go: downloading github.com/tbvdm/go-cli v0.1.0
go: downloading github.com/tbvdm/go-openbsd v0.5.0
go: downloading golang.org/x/text v0.21.0
go: downloading golang.org/x/sys v0.29.0
go: downloading golang.org/x/crypto v0.32.0
package github.com/tbvdm/sigtop
	imports github.com/tbvdm/sigtop/signal
	imports github.com/tbvdm/sigtop/sqlcipher: build constraints exclude all Go files in /Users/runner/work/sigtop/sigtop/sqlcipher
Error: Process completed with exit code 1.