add Jenkinsfile to trigger auto-update all drivers repositories

[lwsanty]

The logic is triggered on curl and runs updater utility https://github.com/bblfsh/sdk/pull/418

Usage

• connect to the cluster
• execute curl

  curl -X POST -H "Content-Type: application/json" \
  -vs https://jenkins.k8s.pipeline.prod.srcd.run/generic-webhook-trigger/invoke\?token\=update \
  -d @- <<'EOF'
  {
  "ref": "refs/heads/master",
  "sdk_version": "3.2.2",
  "script": "echo c > c.txt",
  "branch": "create-a-file-c",
  "commit_msg": "create-a-file commit msg"
  }
  EOF

Signed-off-by: lwsanty lwsanty@gmail.com

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