Make sure correct targets for building rerun_c are installed (#3895)

### What

### Checklist
* [x] I have read and agree to [Contributor
Guide](https://github.com/rerun-io/rerun/blob/main/CONTRIBUTING.md) and
the [Code of
Conduct](https://github.com/rerun-io/rerun/blob/main/CODE_OF_CONDUCT.md)
* [x] I've included a screenshot or gif (if applicable)
* [x] I have tested [demo.rerun.io](https://demo.rerun.io/pr/3895) (if
applicable)
* [x] The PR title and labels are set such as to maximize their
usefulness for the next release's CHANGELOG

- [PR Build Summary](https://build.rerun.io/pr/3895)
- [Docs
preview](https://rerun.io/preview/31ab21163052dc78ee2c0834efb040b514dd21bd/docs)
<!--DOCS-PREVIEW-->
- [Examples
preview](https://rerun.io/preview/31ab21163052dc78ee2c0834efb040b514dd21bd/examples)
<!--EXAMPLES-PREVIEW-->
- [Recent benchmark results](https://ref.rerun.io/dev/bench/)
- [Wasm size tracking](https://ref.rerun.io/dev/sizes/)

.github/actions/setup-rust/action.yml

@@ -26,6 +26,10 @@ inputs:
   service_account:
     type: string
     required: true
+  targets:
+    type: string
+    required: false
+    description: "One or more space separated target triplets that will be ensured to be supported."
 
 runs:
   using: "composite"
@@ -44,6 +48,11 @@ runs:
         rustup show
       shell: bash
 
+    - name: Install additional targets
+      if: ${{ inputs.targets != '' }}
+      run: rustup target add ${{ inputs.targets }}
+      shell: bash
+
     # Rust-cache will cache our dependencies, which is a large chunk of the build
     # See: https://github.com/Swatinem/rust-cache
     - name: Set up rust-cache

.github/workflows/reusable_build_and_upload_rerun_c.yml

@@ -152,6 +152,7 @@ jobs:
           save_cache: false
           workload_identity_provider: ${{ secrets.GOOGLE_WORKLOAD_IDENTITY_PROVIDER }}
           service_account: ${{ secrets.GOOGLE_SERVICE_ACCOUNT }}
+          targets: ${{ needs.set-config.outputs.TARGET }}
 
       - name: Build rerun_c (release)
         uses: actions-rs/cargo@v1