ci: update runner in pr_ci.yml (#170)

* ci: update runner in pr_ci.yml

* ci: update runner setup in pr_ci.yml

* ci: update runner setup in pr_ci.yml

* ci: update runner setup in pr_ci.yml

---------

Co-authored-by: litebito <litebito@users.noreply.github.com>

.github/workflows/pr_ci.yml

@@ -15,7 +15,7 @@ env:
 
 jobs:
   build-and-test:
-    runs-on: [self-hosted, linux, x64, repo-airsonic-pulse]
+    runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
@@ -72,6 +72,18 @@ jobs:
     steps:
       - uses: actions/checkout@v5
 
+      - name: Install system dependencies
+        run: |
+          sudo apt-get update -qq
+          sudo apt-get install -y --no-install-recommends ffmpeg
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v5
+        with:
+          distribution: 'temurin'
+          java-version: '21'
+          cache: 'maven'
+
       - name: Verify environment
         run: |
           java -version