ci(e2e-testing): Add end-to-end test pipeline (#43)

.github/workflows/test.yaml

@@ -0,0 +1,71 @@
+---
+# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
+name: Test E2E
+
+on:
+  # Manual Trigger
+  workflow_dispatch: {}
+
+  # Run on any PR that changes this pipeline or that should ultimately trigger a release when merged
+  pull_request:
+    paths:
+      - ".github/workflows/test.yaml"
+      - "go.mod"
+      - "go.sum"
+      - "**/**.go"
+
+env:
+  KUBECONFIG_DIR: ./configs/
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+
+      - name: Build `kube-switcher`
+        run: go build -o kube-switcher
+
+      - name: Install `minikube`
+        run: |
+          curl -LO https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64
+          sudo install minikube-linux-amd64 /usr/local/bin/minikube && rm minikube-linux-amd64
+
+      - name: Set Up Kubernetes Clusters
+        run: |
+          KUBECONFIG=./configs/cluster1.yaml minikube start -p test-cluster-1 &
+          KUBECONFIG=./configs/cluster2.yaml minikube start -p test-cluster-2 &
+          wait
+
+      - name: Switch context to test-cluster-1
+        run: ./kube-switcher context test-cluster-1
+
+      - name: Validate the cluster has switched to test-cluster-1 by listing nodes
+        run: |
+          kubectl get nodes | grep "test-cluster-1" || { echo "Error: test-cluster-1 not found in node list!" >&2; exit 1; }
+
+      - name: Check that no pods are found in the default namespace
+        run: |
+          kubectl get pods --namespace=default 2>&1 | grep "No resources found" || { echo "Error: Pods found in default namespace!" >&2; exit 1; }
+
+      - name: Switch to the kube-system namespace
+        run: ./kube-switcher namespace kube-system
+
+      - name: Validate that kube-system namespace is selected and kube-apiserver is running
+        run: |
+          kubectl get pods --namespace=kube-system | grep "kube-apiserver" || { echo "Error: kube-apiserver not found in kube-system!" >&2; exit 1; }
+
+      - name: Switch back to the default namespace
+        run: ./kube-switcher namespace default
+
+      - name: Check that no pods are found again in the default namespace
+        run: |
+          kubectl get pods --namespace=default 2>&1 | grep "No resources found" || { echo "Error: Pods found in default namespace!" >&2; exit 1; }
+
+      - name: Switch context to test-cluster-2
+        run: ./kube-switcher context test-cluster-2
+
+      - name: Validate the cluster has switched to test-cluster-2 by listing nodes
+        run: |
+          kubectl get nodes | grep "test-cluster-2" || { echo "Error: test-cluster-2 not found in node list!" >&2; exit 1; }