ci: fix steps

.github/workflows/validate_gentx.yml

@@ -27,20 +27,11 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
-      - name: Setup Go ${{ env.GO_VERSION }}
-        uses: actions/setup-go@v4
-        with:
-          go-version: ${{ env.GO_VERSION }}
-
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
       - name: Build Docker Image
-        uses: docker/build-push-action@v5
-        with:
-          context: .
-          file: ./Dockerfile
-          tags: validate-gentx
+        run: docker build -t validate-gentx .
 
       - name: Run Docker image
         run: docker run validate-gentx