chore(ci-cd): remove redundant Go setup step

Remove the explicit Go installation step in the CI pipeline since Go is already available in the container. The Go proxy mirror configuration remains in place to maintain dependency resolution behavior.

.github/workflows/ci-cd.yml

@@ -14,9 +14,6 @@ jobs:
       - name: Checkout repo
         run: git clone "${{ secrets.G_CLONE_URL }}" .
 
-      - name: Setup go
-        run : echo 'export PATH=$PATH:/usr/local/go/bin' >> ~/.bashrc && source ~/.bashrc
-
       - name: Set go proxy mirror
         run: go env -w GOPROXY=https://go.iranserver.com/repository/go/ && go env -w GOSUMDB=off