add beekeper (e2e) testing github actions workflow (#148)

* add beekeper (e2e) testing github actions workflow

.github/beekeper/bee.yaml

+image:
+  repository: ethersphere/bee
+  tag: latest
+  pullPolicy: Always
+
+ingress:
+  enabled: true
+  annotations:
+    kubernetes.io/ingress.class: traefik
+  hosts:
+    - domain: localhost
+      paths:
+        - /
+
+ingressDebug:
+  enabled: true
+  annotations:
+    kubernetes.io/ingress.class: traefik
+  hosts:
+    - domain: localhost
+      paths:
+        - /
+
+serviceAccount:
+  create: true
+
+resources:
+  limits:
+    memory: 0.5Gi
+    cpu: 0.5
+  requests:
+    memory: 0.25Gi
+    cpu: 0.25
+
+beeConfig:
+  enable_debug_api: true

.github/workflows/beekeper.yaml

+name: Beekeper
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  beekeper:
+    env:
+      REPLICA: 3
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - name: Install k3d
+        run: curl -s https://raw.githubusercontent.com/rancher/k3d/master/install.sh | bash
+      - name: Install latest beekeeper
+        run: |
+          export TAG=$(curl -s https://api.github.com/repos/ethersphere/beekeeper/releases/latest | jq -r .tag_name)
+          curl -Ls https://github.com/ethersphere/beekeeper/releases/download/${TAG}/beekeeper-linux-amd64 -o beekeeper
+          chmod +x beekeeper
+      - name: Create cluster
+        run: k3d create --publish="80:80" --enable-registry --registry-name registry.localhost
+      - name: Set kubeconfig
+        run: |
+          until k3d get-kubeconfig --name='k3s-default' &> /dev/null; do echo "Waiting for the cluster..."; sleep 1; done
+          mkdir ~/.kube
+          cp $(k3d get-kubeconfig --name='k3s-default') ~/.kube/config
+      - name: Set helm repo and namespace
+        run: |
+          helm repo add ethersphere "https://ethersphere.github.io/helm"
+          kubectl create ns bee
+      - name: Build latest bee image
+        run: |
+          docker build --network=host -t registry.localhost:5000/ethersphere/bee:latest .
+          docker push registry.localhost:5000/ethersphere/bee:latest
+      - name: Set bees
+        run: |
+          export LAST_BEE=$(($REPLICA-1))
+          helm install bee -f .github/beekeper/bee.yaml ethersphere/bee --namespace bee --set image.repository=registry.localhost:5000/ethersphere/bee --set replicaCount="${REPLICA}" --set bootnode.enabled=true --wait
+          until curl -s "bee-${LAST_BEE}-debug.localhost/addresses" &> /dev/null; do echo "Waiting for the node..."; sleep 1; done
+      - name: Test peercount
+        run: ./beekeeper check peercount -c "${REPLICA}" -u http://bee-%d-debug.localhost
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