Add cross compiled interop servers

.github/workflows/rust.yml

@@ -5,7 +5,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [macOS-latest]
+        os: [ubuntu-latest, macOS-latest]
         rust: [nightly]
 
     steps:
@@ -13,7 +13,11 @@ jobs:
       with:
         rust-version: ${{ matrix.rust }}
     - uses: actions/checkout@master
+    - name: Run fmt
+      run: cargo fmt -- --check
+    - name: Run check
+      run: cargo check --all --all-features --all-targets
     - name: Run tests
-      run: cargo test --all --verbose
+      run: cargo test --all
     - name: Run interop tests
       run: ./tonic-interop/test.sh

tonic-interop/test.sh

@@ -3,7 +3,13 @@
 set -eu
 set -o pipefail
 
-SERVER="tonic-interop/bin/darwin/server"
+case "$OSTYPE" in
+  darwin*)  OS="darwin" ;;
+  linux*)   OS="linux" ;;
+  *)        exit 2 ;;
+esac
+
+SERVER="tonic-interop/bin/server_${OS}_amd64"
 
 # run the test server
 ./"${SERVER}" &