[hibernate#1930] Add snapshot repository for the examples

We didn't include it in the past because we wanted to keep the examples
simpler. But, we need to be able to test the examples with the snapshots
and it's disabled on the `main` branch as default

Author: DavideD

examples/native-sql-example/build.gradle

@@ -7,6 +7,11 @@ buildscript {
             // Useful for local development, it should be disabled otherwise
             mavenLocal()
         }
+        // Optional: Enables snapshots repository
+        // Example: ./gradlew build -PenableSonatypeOpenSourceSnapshotsRep
+        if ( project.hasProperty('enableSonatypeOpenSourceSnapshotsRep') ) {
+            maven { url 'https://oss.sonatype.org/content/repositories/snapshots/' }
+        }
         mavenCentral()
     }
 }

examples/session-example/build.gradle

@@ -7,6 +7,11 @@ buildscript {
             // Useful for local development, it should be disabled otherwise
             mavenLocal()
         }
+        // Optional: Enables snapshots repository
+        // Example: ./gradlew build -PenableSonatypeOpenSourceSnapshotsRep
+        if ( project.hasProperty('enableSonatypeOpenSourceSnapshotsRep') ) {
+            maven { url 'https://oss.sonatype.org/content/repositories/snapshots/' }
+        }
         mavenCentral()
     }
 }