Move hull tests to a separate job

.github/workflows/pull-request.yaml

@@ -31,9 +31,6 @@ jobs:
       - name: Validate 
         run: sudo make validate
 
-      - name: Run Hull tests
-        run: cd tests && go test -v ./...
-
   check-images:
     name: Check Container Images
     runs-on: ubuntu-latest
@@ -66,4 +63,19 @@ jobs:
 
       - name: Check RC images and charts
         run: make check-rc
-        if: startsWith(github.ref, 'refs/heads/release-v')
+        if: startsWith(github.ref, 'refs/heads/release-v')
+
+  hull-tests:
+    name: Run Hull tests
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout base branch
+        uses: actions/checkout@v3
+
+      - name: Checkout PR
+        run: gh pr checkout ${{ github.event.pull_request.number }}
+        env:
+            GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Run Hull tests
+        run: cd tests && go test -v ./...