Update build-go-win7-dll.yml

Author: FGadvancer

.github/workflows/build-go-win7-dll.yml

@@ -58,6 +58,28 @@ jobs:
         with:
           go-version: "1.20"
 
+      - name: Cache Go modules
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/go/pkg/mod
+            ~/.cache/go-build
+          # Cache key based on go.sum; if go.sum changes, cache busts
+          key: ${{ runner.os }}-go-${{ hashFiles(format('{0}/go.sum', inputs.package_path)) }}
+          restore-keys: |
+            ${{ runner.os }}-go-
+
+      - name: Prepare modules (populate go.sum)
+        working-directory: ${{ inputs.package_path }}
+        run: |
+          # Ensure proxy/sumdb are available on GitHub-hosted runners
+          go env -w GOPROXY=https://proxy.golang.org,direct
+          go env -w GOSUMDB=sum.golang.org
+          # Download all required modules to populate go.sum without modifying go.mod
+          go mod download all
+          # Optional: tighten graph and ensure 1.20 compatibility (may edit go.mod)
+          # go mod tidy -compat=1.20
+
       - name: Install mingw-w64 for CGO cross-compilation
         run: |
           sudo apt-get update