chore: support automatically changing go version

zx/ensure_go_version.mjs

@@ -0,0 +1,22 @@
+#!/usr/bin/env zx
+
+$.verbose = false;
+
+
+try  {
+    const catOutput = await $`cat go.mod`;
+    const contents = catOutput.stdout;
+
+    const lines = contents.split("\n");
+    let goVersion = "";
+    for (let line of lines) {
+        if (line.startsWith("go ")) {
+            goVersion = line.substring("go ".length);
+            break
+        }
+    }
+    await $`gvm install go${goVersion}`
+    console.log(goVersion)
+} catch (e) {
+    await $`exit 0`;
+}