feat: An action to test operator at PR time (#4635)

Author: dmartinol

.github/workflows/operator_pr.yml

@@ -0,0 +1,18 @@
+name: operator-pr
+
+on: [pull_request]
+jobs:
+  operator-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.21.x
+      - name: Operator tests
+        run: |
+          cd infra/feast-operator/
+          make test
+      - name: After code formatting, check for uncommitted differences
+        run: git diff --exit-code infra/feast-operator