Add e2e workflow for end-to-end testing

- Created a new GitHub Actions workflow for end-to-end testing.
- Configured the workflow to trigger on pull requests and pushes to main and master branches.
- Set up steps to check out the repository, install Go, kind, and kubectl, deploy SandboxFleet to kind, and run e2e tests.

Author: FAUST-BENCHOU

.github/workflows/e2e.yaml

@@ -0,0 +1,45 @@
+name: e2e
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+      - master
+  workflow_dispatch:
+
+jobs:
+  e2e:
+    runs-on: ubuntu-latest
+    timeout-minutes: 45
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+
+      - name: Install kind
+        run: |
+          curl -fsSL -o ./kind "https://kind.sigs.k8s.io/dl/v0.27.0/kind-linux-amd64"
+          chmod +x ./kind
+          sudo mv ./kind /usr/local/bin/kind
+          kind version
+
+      - name: Install kubectl
+        run: |
+          curl -fsSL -o ./kubectl "https://dl.k8s.io/release/$(curl -fsSL https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
+          chmod +x ./kubectl
+          sudo mv ./kubectl /usr/local/bin/kubectl
+          kubectl version --client
+
+      - name: Deploy SandboxFleet to kind
+        env:
+          WORKER_RUNTIME: gvisor
+          APPLY_SAMPLES: "0"
+        run: ./hack/deploy-kind.sh
+
+      - name: Run e2e tests
+        run: ./hack/verify-e2e.sh