env/wasip1-wasm-wasmedge: fix Docker error

Docker's picky apparently.

Step 9/11 : COPY --from=builder /root/.wasmedge/lib/* /usr/local/lib
When using COPY with more than one source file, the destination must be a directory and end with a /

Change-Id: I96702e129fd4bd5d6577375f0dd865fab5a88c49
Reviewed-on: https://go-review.googlesource.com/c/build/+/496188
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Heschi Kreinick <heschi@google.com>
Reviewed-by: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>
Run-TryBot: Heschi Kreinick <heschi@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
diff --git a/env/wasip1-wasm-wasmedge/Dockerfile b/env/wasip1-wasm-wasmedge/Dockerfile
index 0e914c4..588a53b 100644
--- a/env/wasip1-wasm-wasmedge/Dockerfile
+++ b/env/wasip1-wasm-wasmedge/Dockerfile
@@ -17,7 +17,7 @@
 FROM ${REPO}/linux-x86-sid:20221109
 
 COPY --from=builder /root/.wasmedge/bin/wasmedge /usr/local/bin/wasmedge
-COPY --from=builder /root/.wasmedge/lib/* /usr/local/lib
+COPY --from=builder /root/.wasmedge/lib/* /usr/local/lib/
 
 ENV LD_LIBRARY_PATH=/usr/local/lib