Add wasm-go example

wasm-go/.flox/.gitignore

@@ -0,0 +1,4 @@
+run/
+cache/
+lib/
+log/

wasm-go/.flox/env.json

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+{
+  "name": "wasm-go",
+  "version": 1
+}

wasm-go/.flox/env/manifest.toml

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+version = 1
+[install]
+wasmtime.pkg-path = "wasmtime"
+go.pkg-path = "go"
+
+[vars]
+GOOS="wasip1"
+GOARCH="wasm"
+
+[hook]
+[profile]
+[services]
+[options]
+systems = ["aarch64-darwin", "aarch64-linux", "x86_64-darwin", "x86_64-linux"]

wasm-go/test.sh

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+#!/usr/bin/env bash
+
+set -eo pipefail
+
+echo '
+package main
+
+import "fmt"
+
+func main() {
+    fmt.Println("Hello world!")
+}
+' > main.go
+
+go build -o main.wasm main.go
+
+ACTUAL="$(wasmtime main.wasm)"
+EXPECTED="Hello world!"
+
+if [ "$ACTUAL" != "$EXPECTED" ]; then
+    echo "Error: 'wasmtime main.wasm' did not return '$EXPECTED'."
+    exit 1
+fi
+
+rm main.go main.wasm