Add pkg/parsers/architecture and pkg/platform

Signed-off-by: Vincent Demeester <vincent@sbr.pm>

platform/architecture_freebsd.go

@@ -0,0 +1,15 @@
+package platform
+
+import (
+	"os/exec"
+)
+
+// GetRuntimeArchitecture get the name of the current architecture (x86, x86_64, …)
+func GetRuntimeArchitecture() (string, error) {
+	cmd := exec.Command("uname", "-m")
+	machine, err := cmd.Output()
+	if err != nil {
+		return "", err
+	}
+	return string(machine), nil
+}