Enabled dependabot on 3.1

Author: DavideD

.github/dependabot.yml

@@ -19,6 +19,41 @@ updates:
 
   - package-ecosystem: "gradle"
     directory: "/"
+    target-branch: "main"
+    schedule:
+      interval: "weekly"
+      day: "tuesday"
+    open-pull-requests-limit: 20
+    groups:
+      hibernate-validator:
+        patterns:
+          - "org.hibernate.validator*"
+          - "org.glassfish.expressly*"
+      hibernate:
+        patterns:
+          - "org.hibernate*"
+      vertx:
+        patterns:
+          - "io.vertx*"
+      mutiny:
+        patterns:
+          - "io.smallrye.reactive*"
+      # Testcontainers plus the JDBC driver we need for testing
+      testcontainers:
+        patterns:
+          - "org.testcontainers*"
+          - "com.ibm.db2*"
+          - "com.microsoft.sqlserver*"
+          - "org.postgresql*"
+          - "con.ongres.scram*"
+          - "com.fasterxml.jackson.core*"
+          - "com.mysql*"
+          - "org.mariadb.jdbc*"
+
+  # Duplicated package-ecosystem for every extra branch we want to target
+  - package-ecosystem: "gradle"
+    directory: "/"
+    target-branch: "3.1"
     schedule:
       interval: "weekly"
       day: "tuesday"