[FLINK-31923] Run nightly builds against multiple branches and Flink versions

Author: MartijnVisser

.github/workflows/weekly.yml

@@ -26,8 +26,27 @@ jobs:
     if: github.repository_owner == 'apache'
     strategy:
       matrix:
-        flink: [1.16-SNAPSHOT, 1.17-SNAPSHOT, 1.18-SNAPSHOT]
+        flink_branches: [{
+          flink: 1.16-SNAPSHOT,
+          branch: main
+        }, {
+          flink: 1.17-SNAPSHOT,
+          branch: main
+        }, {
+          flink: 1.18-SNAPSHOT,
+          branch: main
+        }, {
+          flink: 1.16.2,
+          branch: v3.1
+        }, {
+          flink: 1.17.1,
+          branch: v3.1
+        }, {
+          flink: 1.18-SNAPSHOT,
+          branch: v3.1
+        }]
     uses: apache/flink-connector-shared-utils/.github/workflows/ci.yml@ci_utils
     with:
-      flink_version: ${{ matrix.flink }}
+      flink_version: ${{ matrix.flink_branches.flink }}
+      connector_branch: ${{ matrix.flink_branches.branch }}
       run_dependency_convergence: false