feat(jsii-pacmak): allow disabling go build conditionally (#4196)

In CDKTF this step causes our examples to take up to 24GB of Ram and ~5 minutes to have the bindings generated. We split our code into a lot of modules, so if a user just ran `go run ...` and only the parts needed would be compiled they can save a lot of time and resources.

packages/jsii-pacmak/lib/targets/go.ts

@@ -54,7 +54,13 @@ export class Golang extends Target {
       );
       return Promise.reject(e);
     }
-    await go('build', ['-modfile', localGoMod.path, './...'], { cwd: pkgDir });
+
+    if (process.env.JSII_BUILD_GO) {
+      // This step is taken to ensure that the generated code is compilable
+      await go('build', ['-modfile', localGoMod.path, './...'], {
+        cwd: pkgDir,
+      });
+    }
 
     // delete local.go.mod and local.go.sum from the output directory so it doesn't get published
     const localGoSum = `${path.basename(localGoMod.path, '.mod')}.sum`;