ci: Split release into a separate PR build workflow

Because the release workflow already runs on dev and main, it is not necessary to also trigger it for PRs.

.github/workflows/build_pull_request.yml

@@ -0,0 +1,23 @@
+name: Build pull request
+
+on:
+  workflow_dispatch:
+  pull_request:
+    branches:
+      - dev
+
+jobs:
+  release:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Cache Gradle
+        uses: burrunan/gradle-cache-action@v1
+
+      - name: Build
+        run: ./gradlew build clean

.github/workflows/release.yml

@@ -6,10 +6,6 @@ on:
     branches:
       - main
       - dev
-  pull_request:
-    branches:
-      - main
-      - dev
 
 jobs:
   release: