Add CI validation job for Flow Visibility (#3312)

In this commit, we add a CI validation job for Flow Visibility. It will
validate the deployment of Flow Exporter, Flow Aggregator, Clickhouse
Server, and Grafana UI dashboard. It will execute daily on Jenkins like
what we have before for the ELK Flow Collector setup.

Signed-off-by: Yongming Ding <dyongming@vmware.com>

.github/workflows/docker_update_flow_visibility.yml

@@ -0,0 +1,52 @@
+# Anyone with write permissions to the antrea-io/antrea Github repository can
+# trigger this workflow manually, but please check with a maintainer first. The
+# workflow will tag and push flow visibility related external images into Antrea
+# Docker hub.
+name: Manually update flow visibility Docker images
+
+on:
+  workflow_dispatch:
+    inputs:
+      ch-operator-tag:
+        description: 'Tag for clickhouse-operator and metrics-exporter Docker image'
+        required: true
+      grafana-tag:
+        description: 'Tag for grafana Docker image'
+        required: true
+      ch-server-tag:
+        description: 'Tag for clickhouse-server Docker image'
+        required: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      - name: Push antrea/flow-visibility-clickhouse-operator
+        uses: akhilerm/tag-push-action@v2.0.0
+        with:
+          src: docker.io/altinity/clickhouse-operator:${{ github.event.inputs.ch-operator-tag }}
+          dst: |
+            docker.io/antrea/flow-visibility-clickhouse-operator:${{ github.event.inputs.ch-operator-tag }}
+      - name: Push antrea/flow-visibility-metrics-exporter
+        uses: akhilerm/tag-push-action@v2.0.0
+        with:
+          src: docker.io/altinity/metrics-exporter:${{ github.event.inputs.ch-operator-tag }}
+          dst: |
+            docker.io/antrea/flow-visibility-metrics-exporter:${{ github.event.inputs.ch-operator-tag }}
+      - name: Push antrea/flow-visibility-grafana
+        uses: akhilerm/tag-push-action@v2.0.0
+        with:
+          src: docker.io/grafana/grafana:${{ github.event.inputs.grafana-tag }}
+          dst: |
+            docker.io/antrea/flow-visibility-grafana:${{ github.event.inputs.grafana-tag }}
+      - name: Push antrea/flow-visibility-clickhouse-server
+        uses: akhilerm/tag-push-action@v2.0.0
+        with:
+          src: docker.io/yandex/clickhouse-server:${{ github.event.inputs.ch-server-tag }}
+          dst: |
+            docker.io/antrea/flow-visibility-clickhouse-server:${{ github.event.inputs.ch-server-tag }}