Usage of artifacts produced by Gradle instead of -dev scripts

lf/src/Passing.lf

@@ -1,5 +1,7 @@
 target C
 
 main reactor {
-  reaction(startup) {= printf("Hello World.\n"); =}
+  reaction(startup) {=
+    printf("Hello World.\n");
+  =}
 }

src/build.ts

@@ -15,13 +15,17 @@ export async function clone(ref: string, dir: string): Promise<void> {
   await exec('git submodule update --init', {cwd: dir})
 }
 
+export async function build(dir: string): Promise<void> {
+  await exec('./gradlew assemble', {cwd: dir})
+}
+
 export async function gradleStop(dir: string): Promise<void> {
-  exec('./gradlew --stop', {cwd: dir})
+  await exec('./gradlew --stop', {cwd: dir})
 }
 
 export function configurePath(dir: string): void {
   process.env.PATH = `${process.env.PATH}:${path.join(
     path.resolve(dir),
-    'bin'
+    'build/install/lf-cli/bin'
   )}`
 }

src/main.ts

@@ -1,5 +1,5 @@
 import * as core from '@actions/core'
-import {configurePath, deleteIfExists, clone, gradleStop} from './build'
+import {configurePath, deleteIfExists, clone, gradleStop, build} from './build'
 import {skipDirs, checkCompile, checkFormat} from './check'
 
 // eslint-disable-next-line no-shadow
@@ -34,6 +34,9 @@ export async function run(softError = false): Promise<string> {
       await clone(ref, dir)
     }
 
+    core.info(`Building using Gradle...`)
+    await build(dir)
+
     configurePath(dir)
 
     core.info('Checking all Lingua Franca files:')