chore: document local cli build (#40227)

cli/CONTRIBUTING.md

@@ -18,3 +18,15 @@ cd cli && cargo publish
 We manage publishing releases through [`cargo-dist`](https://github.com/axodotdev/cargo-dist)
 
 We release semi-regularly, as new features are added. If a release breaks your CI or workflow, please open an issue on GitHub, and tag one or all of the crate authors
+
+## Running a local build
+
+From the `./cli` directory run `cargo install --path .` to build a new version
+
+If you want to replace an existing installation of the CLI you will need to copy the generated target to override it:
+
+```bash
+cp ./target/release/posthog-cli "$(which posthog-cli)"
+```
+
+Tip: it can be useful to bump the version in `./cli/Cargo.toml` and run `posthog-cli --version` to ensure you're running your local version

cli/src/api/symbol_sets.rs

@@ -148,7 +148,7 @@ fn upload_to_s3(presigned_url: PresignedUrl, data: &[u8]) -> Result<()> {
                 }
             }
             Result::Err(e) => {
-                last_err = Some(anyhow!("Failed to upload chunk: {e}"));
+                last_err = Some(anyhow!("Failed to upload chunk: {e:?}"));
             }
         }
         if attempt < 3 {