test: add e2e circuit breaker rollback detection test

Author: Batuhan Aykac

.github/workflows/circuit-breaker-test.yml

@@ -0,0 +1,49 @@
+name: Circuit Breaker Test
+on: workflow_dispatch
+jobs:
+  test-happy-path:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: aws-actions/configure-aws-credentials@v4
+        with:
+          aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
+          aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
+          aws-session-token: ${{ secrets.AWS_SESSION_TOKEN }}
+          aws-region: us-west-2
+      - name: Deploy good image (should succeed)
+        uses: ./
+        with:
+          task-definition: test-task-def-good.json
+          service: cb-test-svc
+          cluster: cb-test
+          wait-for-service-stability: true
+          force-new-deployment: true
+
+  test-rollback-detection:
+    runs-on: ubuntu-latest
+    needs: test-happy-path
+    steps:
+      - uses: actions/checkout@v4
+      - uses: aws-actions/configure-aws-credentials@v4
+        with:
+          aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
+          aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
+          aws-session-token: ${{ secrets.AWS_SESSION_TOKEN }}
+          aws-region: us-west-2
+      - name: Deploy bad image (should fail)
+        id: bad-deploy
+        uses: ./
+        continue-on-error: true
+        with:
+          task-definition: test-task-def-bad.json
+          service: cb-test-svc
+          cluster: cb-test
+          wait-for-service-stability: true
+      - name: Assert it failed
+        run: |
+          if [ "${{ steps.bad-deploy.outcome }}" != "failure" ]; then
+            echo "::error::Expected failure but got ${{ steps.bad-deploy.outcome }}"
+            exit 1
+          fi
+          echo "Correctly detected circuit breaker rollback!"

test-task-def-bad.json

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+{"family":"cb-test","requiresCompatibilities":["FARGATE"],"networkMode":"awsvpc","cpu":"256","memory":"512","containerDefinitions":[{"name":"web","image":"public.ecr.aws/nginx/nginx:this-tag-does-not-exist-99999","essential":true,"portMappings":[{"containerPort":80}]}]}

test-task-def-good.json

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+{"family":"cb-test","requiresCompatibilities":["FARGATE"],"networkMode":"awsvpc","cpu":"256","memory":"512","containerDefinitions":[{"name":"web","image":"public.ecr.aws/nginx/nginx:latest","essential":true,"portMappings":[{"containerPort":80}]}]}