misc/wasm: add wasmer to wasip1 script

The wasmer runtime will be used to test our wasip1
implementation against the WASI runtime from wasmer.io.

For #59907

Change-Id: Ie7e48c39e03075815ddca46d996b6ec87009b12a
Reviewed-on: https://go-review.googlesource.com/c/go/+/493775
TryBot-Result: Gopher Robot <[email protected]>
Reviewed-by: Cherry Mui <[email protected]>
Run-TryBot: Johan Brandhorst-Satzkorn <[email protected]>
Reviewed-by: Bryan Mills <[email protected]>

Author: johanbrandhorst

misc/wasm/go_wasip1_wasm_exec

@@ -4,6 +4,9 @@
 # license that can be found in the LICENSE file.
 
 case "$GOWASIRUNTIME" in
+	"wasmer")
+		exec wasmer run --dir=/ --env PWD="$PWD" "$1" -- "${@:2}"
+		;;
 	"wasmtime")
 		exec wasmtime run --dir=/ --env PWD="$PWD" --max-wasm-stack 1048576 "$1" -- "${@:2}"
 		;;