fix: integration tests (#766)

Author: ilgooz

.github/workflows/test-integration.yml

@@ -20,6 +20,11 @@ jobs:
           go-version: "1.16"
           stable: false
 
+      - name: "Get Go 1.15"	
+        run: |	
+          go get golang.org/dl/go1.15	
+          go1.15 download	
+
       - name: Install protoc
         uses: arduino/setup-protoc@v1
 
@@ -52,3 +57,5 @@ jobs:
       - name: Run Integration Tests
         working-directory: ${{ env.working-directory }}
         run: ./scripts/test-integration 
+        env:
+          GONAME: "go1.15"