Add instructions for running GitHub Actions locally.

.github/workflows/rust.yml

@@ -276,7 +276,7 @@ jobs:
         cp -p bazel/cargo/Cargo.Bazel.lock Cargo.lock
         cargo audit
 
-  example:
+  examples:
     runs-on: ubuntu-latest
 
     strategy:
@@ -340,7 +340,7 @@ jobs:
           --mode validate \
           -c envoy.yaml
 
-  reactor:
+  reactors:
     runs-on: ubuntu-latest
 
     strategy:
@@ -368,7 +368,7 @@ jobs:
       run: |
         curl -OL https://static.rust-lang.org/rustup/rustup-init.sh
         chmod +x ./rustup-init.sh
-        ./rustup-init.sh -y
+        ./rustup-init.sh -y --default-toolchain nightly
         rm rustup-init.sh
         echo "$HOME/.cargo/bin" >> $GITHUB_PATH
 

README.md

@@ -28,10 +28,30 @@
 - [Extending Envoy with WASM and Rust](https://antweiss.com/blog/extending-envoy-with-wasm-and-rust/)
 - [Writing Envoy filters in Rust with WebAssembly](https://content.red-badger.com/resources/extending-istio-with-rust-and-webassembly)
 
-## Updating dependencies
+## Development
+
+### Testing
+
+GitHub Actions can be executed locally using the [`act`] tool.
+
+All tests can be executed using:
+
+    act
+
+Individual tests can be executed using `-j` and `--matrix` parameters, e.g.:
+
+    act -j bazel
+    act -j stable
+    act -j nightly
+    act -j examples --matrix example:http_auth_random
+
+### Updating Bazel dependencies
 
 When updating dependencies, you need to regenerate Bazel `BUILD` files to match updated `Cargo.toml`:
 
 ```sh
 bazel run //bazel/cargo:crates_vendor -- --repin all
 ```
+
+
+[`act`]: https://github.com/nektos/act