Fix Paper dependency resolution and PR validation

.github/workflows/release.yml

@@ -1,6 +1,16 @@
 name: Release
 
 on:
+  pull_request:
+    paths:
+      - '.github/workflows/release.yml'
+      - 'build.gradle'
+      - 'settings.gradle'
+      - 'common/**'
+      - 'paper/**'
+      - 'fabric/**'
+      - 'fabric-legacy/**'
+      - 'scripts/**'
   schedule:
     - cron: '23 3 * * *'
   push:
@@ -270,7 +280,7 @@ jobs:
   release:
     name: Publish multi-version release
     needs: [discover, common-tests, paper-builds, fabric-builds]
-    if: ${{ always() && needs.common-tests.result == 'success' && needs.paper-builds.result == 'success' }}
+    if: ${{ always() && github.event_name != 'pull_request' && needs.common-tests.result == 'success' && needs.paper-builds.result == 'success' }}
     runs-on: ubuntu-latest
 
     steps:

paper/build.gradle

@@ -35,3 +35,13 @@ tasks.jar {
         )
     }
 }
+
+configurations.configureEach {
+    resolutionStrategy.eachDependency { details ->
+        if (details.requested.group == 'net.kyori' &&
+            details.requested.version == '4.17.0-SNAPSHOT') {
+            details.useVersion '4.17.0'
+            details.because 'Paper 1.20.5 API references an expired Adventure snapshot'
+        }
+    }
+}