Add packaging and release automation

vendor/github.com/muesli/termenv/termenv_solaris.go

@@ -0,0 +1,22 @@
+//go:build solaris || illumos
+// +build solaris illumos
+
+package termenv
+
+import (
+	"golang.org/x/sys/unix"
+)
+
+func isForeground(fd int) bool {
+	pgrp, err := unix.IoctlGetInt(fd, unix.TIOCGPGRP)
+	if err != nil {
+		return false
+	}
+
+	g, err := unix.Getpgrp()
+	if err != nil {
+		return false
+	}
+
+	return pgrp == g
+}