Add example of downloading rerun c++ lib via pixi

Author: traversaro

.github/workflows/cpp.yml

@@ -14,4 +14,7 @@ jobs:
           pixi-version: v0.25.0
           cache: true
 
-      - run: pixi run build
+      - name: run build task on all environments
+        run: |
+          pixi run -e default build
+          pixi run -e rerunfindpackage build

.gitignore

@@ -1,5 +1,6 @@
-# Build directory
+# Build directories
 build
+buildrerunfindpackage
 
 # Pixi environment
 .pixi

README.md

@@ -16,8 +16,11 @@ This is a minimal CMake project that shows how to use [Rerun](https://github.com
 The easiest way to get started is to install [pixi](https://prefix.dev/docs/pixi/overview).
 
 The pixi environment described in `pixi.toml` contains all of the dependencies, including the rerun viewer,
-allowing you to run the example with a single command:
-* `pixi run example`
+allowing you to run the example with a single command, while the rerun C++ SDK is downloaded via `FetchContent`
+* `pixi run -e default example`
+
+If you want to also download rerun C++ SDK via pixi, you can run:
+* `pixi run -e rerundfindpackage example`
 
 ## Without `pixi`
 If you choose not to use pixi, you will need to install a few things yourself before you get started.