chore: make fluvio version works when publishing (#4184)

Author: fraidev

crates/fluvio/VERSION

@@ -0,0 +1 @@
+../../VERSION

crates/fluvio/build.rs

@@ -1,8 +1,8 @@
 fn main() {
     // Copy VERSION file. Do not fail e.g. when built via `cargo publish`
-    if let Ok(verpath) = std::fs::canonicalize("../../VERSION") {
+    if let Ok(verpath) = std::fs::canonicalize("./VERSION") {
         if verpath.exists() {
-            println!("cargo:rerun-if-changed=../../VERSION");
+            println!("cargo:rerun-if-changed=./VERSION");
         }
     }
     println!("cargo:rerun-if-changed=build.rs");

crates/fluvio/src/lib.rs

@@ -46,7 +46,7 @@ use tracing::instrument;
 
 /// The minimum VERSION of the Fluvio Platform that this client is compatible with.
 const MINIMUM_PLATFORM_VERSION: &str = "0.9.0";
-pub(crate) const VERSION: &str = include_str!("../../../VERSION");
+pub(crate) const VERSION: &str = include_str!(concat!(env!("CARGO_MANIFEST_DIR"), "/VERSION"));
 
 /// Creates a producer that sends records to the named topic
 ///