update rustc compiler if the version does not satisfy minimal requirements of vergen-gix

Signed-off-by: Uncle Stretch <uncle.stretch@ghostchain.io>

update.sh

@@ -10,6 +10,20 @@ else
     echo "[+] nothing to update from the remote repository"
 fi
 
+REQUIRED_VERSION="1.91.0"
+CURRENT_VERSION=$(cargo --version | awk '{print $2}')
+
+HIGHEST=$(printf '%s\n%s' "$CURRENT_VERSION" "$REQUIRED_VERSION" | sort -rV | head -n1)
+if [ "$HIGHEST" == "$REQUIRED_VERSION" ]; then
+    echo "[!] Need to update rustc compiler because of the vergen-gix dependency"
+    echo "[!] For more info: https://github.com/rustyhorde/vergen#msrv"
+    rustup update
+    echo "[+] Setting latest rustc compiler version as a default one"
+    rustup default stable
+    echo "[+] Cleaning previous targets"
+    cargo clean
+fi
+
 echo "[+] build for the new version starts in 3 seconds..."
 sleep 3
 cargo build --release