Fix: Install curl and create toolcache directory before downloading Go

.github/workflows/build.yml

@@ -111,7 +111,15 @@ jobs:
 
       - name: Install Go 1.23
         run: |
-          # Always download Go 1.23 directly to ensure correct version
+          # Create toolcache directory if not exists
+          mkdir -p /toolcache
+          # Install curl if not available (Alpine uses apk)
+          if ! command -v curl &> /dev/null; then
+            if command -v apk &> /dev/null; then
+              apk add --no-cache curl
+            fi
+          fi
+          # Download Go 1.23 directly to ensure correct version
           curl -sL https://go.dev/dl/go1.23.0.linux-amd64.tar.gz | tar xz -C /toolcache
           echo "/toolcache/go/bin" >> $GITHUB_PATH
           echo "GOROOT=/toolcache/go" >> $GITHUB_ENV