Fix windows build.

workflow-prepare.sh

@@ -4,5 +4,41 @@
 
 set -e
 
+# Detect OS
+OS=$(uname -s | tr '[:upper:]' '[:lower:]')
+
+# On Windows, install SQLite development headers for CGO
+if [[ "$OS" == mingw* ]] || [[ "$OS" == msys* ]] || [[ "$OS" == cygwin* ]]; then
+    echo "Installing SQLite for Windows..."
+
+    # Download SQLite amalgamation and set up for CGO
+    SQLITE_VERSION="3470200"
+    SQLITE_YEAR="2024"
+    SQLITE_DIR="/c/sqlite"
+    SQLITE_URL="https://www.sqlite.org/${SQLITE_YEAR}/sqlite-amalgamation-${SQLITE_VERSION}.zip"
+
+    mkdir -p "$SQLITE_DIR"
+    curl -sSL "$SQLITE_URL" -o /tmp/sqlite.zip
+    unzip -q /tmp/sqlite.zip -d /tmp/
+    cp /tmp/sqlite-amalgamation-${SQLITE_VERSION}/* "$SQLITE_DIR/"
+    rm -rf /tmp/sqlite.zip /tmp/sqlite-amalgamation-${SQLITE_VERSION}
+
+    # Download Go modules first so we can patch sqlite-vec
+    echo "Downloading Go modules..."
+    go mod download
+
+    # Find the sqlite-vec module and copy sqlite3.h there
+    SQLITE_VEC_PATH=$(go list -m -f '{{.Dir}}' github.com/asg017/sqlite-vec-go-bindings 2>/dev/null || true)
+    if [ -n "$SQLITE_VEC_PATH" ] && [ -d "$SQLITE_VEC_PATH/cgo" ]; then
+        # Make module writable (it's read-only by default)
+        chmod -R u+w "$SQLITE_VEC_PATH"
+        cp "$SQLITE_DIR/sqlite3.h" "$SQLITE_VEC_PATH/cgo/"
+        cp "$SQLITE_DIR/sqlite3.c" "$SQLITE_VEC_PATH/cgo/"
+        echo "SQLite headers copied to $SQLITE_VEC_PATH/cgo/"
+    fi
+
+    echo "SQLite setup complete"
+fi
+
 # Download ONNX runtime libraries for current platform
 ./scripts/download-onnx-libs.sh auto