Purge cloudflare cache

[Aivean]

Takes secrets from the environment. Skips step if secrets are not available.

Tested during staging deploy: https://github.com/spaceshelter/orbitar/actions/runs/5095398411/jobs/9160299195

(I temporarily added secrets to Staging env, now they are removed)

Run curl --request POST \
  curl --request POST \
    --url https://api.cloudflare.com/client/v4/zones/***/purge_cache \
    --header 'Content-Type: application/json' \
    --header 'Authorization: ***' \
    --data '{
    "purge_everything": true
  }'
  shell: /usr/bin/bash -e {0}
  env:
    CLOUDFLARE_ZONE: ***
    CLOUDFLARE_BEARER_TOKEN: ***
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
{
  "result": {
    "id": "***"
  },
  "success": true,
  "errors": [],
  "messages": []
}

[Aivean]

LGTM. Make sure that secrets are not outputted anywhere in build logs

they don't