update build-source.md (#162)

docs/guides/nwaku/build-source.md

@@ -23,8 +23,9 @@ import TabItem from '@theme/TabItem';
 <TabItem value="debian" label="Debian and Ubuntu">
 
 ```shell
-sudo apt-get install build-essential git libpq5
+sudo apt-get install build-essential git libpq5 jq
 curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+source "$HOME/.cargo/env"
 ```
 
 </TabItem>
@@ -113,4 +114,4 @@ make test
 
 :::tip Congratulations!
 You have successfully built the `nwaku` binary from the source code. Have a look at the [Node Configuration Examples](/guides/nwaku/configure-nwaku) guide to learn how to configure `nwaku` for different use cases.
-:::
+:::