fix(libvirt): create sidecar to rotate creds (#865)

diff --git a/internal/net/hostname.go b/internal/net/hostname.go
new file mode 100644
index 0000000..a2a7c96
--- /dev/null
+++ b/internal/net/hostname.go
@@ -0,0 +1,21 @@
+package net
+
+import (
+	"os"
+	"os/exec"
+	"strings"
+)
+
+func Hostname() (string, error) {
+	return os.Hostname()
+}
+
+func FQDN() (string, error) {
+	cmd := exec.Command("/bin/hostname", "--fqdn")
+	out, err := cmd.Output()
+	if err != nil {
+		return "", err
+	}
+
+	return strings.TrimSpace(string(out)), nil
+}