Update build.yml

.github/workflows/build.yml

@@ -7,16 +7,15 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     timeout-minutes: 40
     steps:
       - uses: actions/checkout@v2
-      - uses: DeLaGuardo/setup-graalvm@4.0
+      - name: Set up JDK 11
+        uses: actions/setup-java@v2.5.0
         with:
-          graalvm: 21.2.0
-          java: java11
-          arch: amd64
-      - uses: actions/cache@v2
+          java-version: 11
+      - uses: actions/cache@v2.1.7
         with:
           path: |
             ~/.gradle/caches
@@ -24,10 +23,4 @@ jobs:
           key: ${{ runner.os }}-gradle-${{ hashFiles('*.gradle.kts') }}
           restore-keys: |
             ${{ runner.os }}-gradle-
-      - uses: actions/cache@v2
-        with:
-          path: ~/.konan
-          key: ${{ runner.os }}-gradle-${{ hashFiles('*.gradle.kts') }}
-          restore-keys: |
-            ${{ runner.os }}-gradle-
       - run: ./gradlew build --build-cache --no-daemon --stacktrace