Run client-tester in CI

Author: stephank

.github/workflows/check.yml

@@ -51,3 +51,22 @@ jobs:
 
       - name: PHPUnit
         run: vendor/bin/phpunit --teamcity
+
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: ^1.16
+
+      - name: Go cache
+        uses: actions/cache@v2
+        with:
+          path: ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
+
+      - name: Build tester
+        run: go get -v github.com/portier/client-tester
+
+      - name: Run test suite
+        run: ~/go/bin/client-tester -bin ./client-tester.php