Small tweaks to bring in line with other Kubernetes tools

src/version.rs

@@ -0,0 +1,11 @@
+pub const VERSION: &str = get_version();
+
+const fn get_version() -> &'static str {
+    if let Some(version) = std::option_env!("RELEASE_VERSION")
+        && !version.is_empty()
+    {
+        version
+    } else {
+        git_version::git_version!(fallback = "unknown")
+    }
+}