Update set github env for unit-test

Author: MoonSupport

.github/workflows/unit-tests.yml

@@ -24,9 +24,9 @@ jobs:
     # https://help.github.com/en/actions/reference/workflow-commands-for-github-actions
     - name: Set build variables
       run: |
-        echo "::set-env name=MAKE_TARGET::${{ matrix.make_target }}"
-        echo "::set-env name=GO_FLAGS::-mod=vendor"
-        echo "::set-env name=GO111MODULE::on"
+        echo "MAKE_TARGET=${{ matrix.make_target }}"
+        echo "GO_FLAGS=-mod=vendor"
+        echo "GO111MODULE=on"
 
     - name: Run ${{matrix.make_target}}
       run: |