Fix the way we're generating certificates on our test deployments

[svyatonik]

Right now we're hitting 5 certs/week limit (https://letsencrypt.org/docs/rate-limits/) when generating certificates for our test deployments nodes:

Create new order error. Le_OrderFinalize not found. {
  "type": "urn:ietf:params:acme:error:rateLimited",
  "detail": "Error creating new order :: too many certificates (5) already issued for this exact set of domains in the last 168 hours: ui.brucke.link: see https://letsencrypt.org/docs/rate-limits/",
  "status": 429
}

At first glance, possible solutions are:

1. actually store generated certificates (proper way imo);
2. do restarts less often (e.g. every other day).

[serban300]

According to this and this issues we might need to add a volume:

- letsencrypt-acme:/etc/acme.sh

both for the nginx-proxy and the nginx-proxy-le containers in order to persist the SSL certificates.

[serban300]

Merged #1554 that should fix this. However keeping this opened for a while until the current rate-limiting window expires and we can check that the issue is actually fixed.

[serban300]

The certificates seem to be downloaded in the persisted volume:

[Wed Aug 24 12:03:35 UTC 2022] Your cert is in  /etc/acme.sh/admin@parity.io/grafana.millau.brucke.link/grafana.millau.brucke.link.cer 
[Wed Aug 24 12:03:35 UTC 2022] Your cert key is in  /etc/acme.sh/admin@parity.io/grafana.millau.brucke.link/grafana.millau.brucke.link.key 
[Wed Aug 24 12:03:35 UTC 2022] The intermediate CA cert is in  /etc/acme.sh/admin@parity.io/grafana.millau.brucke.link/ca.cer 
[Wed Aug 24 12:03:35 UTC 2022] And the full chain certs is there:  /etc/acme.sh/admin@parity.io/grafana.millau.brucke.link/fullchain.cer 
[Wed Aug 24 12:03:35 UTC 2022] Installing cert to:/etc/nginx/certs/grafana.millau.brucke.link/cert.pem
[Wed Aug 24 12:03:36 UTC 2022] Installing CA to:/etc/nginx/certs/grafana.millau.brucke.link/chain.pem
[Wed Aug 24 12:03:36 UTC 2022] Installing key to:/etc/nginx/certs/grafana.millau.brucke.link/key.pem
[Wed Aug 24 12:03:36 UTC 2022] Installing full chain to:/etc/nginx/certs/grafana.millau.brucke.link/fullchain.pem

Waiting a couple more days to make sure that the issue doesn't reproduce.

[serban300]

The issue doesn't seem to reproduce and from the logs it seems that the certificates are persisted and aren't renewed on every restart:

Creating/renewal grafana.millau.brucke.link certificates... (grafana.millau.brucke.link grafana.rialto.brucke.link)
[Mon Aug 29 05:01:52 UTC 2022] Domains not changed.
[Mon Aug 29 05:01:52 UTC 2022] Skip, Next renewal time is: Sun Oct 23 12:03:35 UTC 2022
[Mon Aug 29 05:01:52 UTC 2022] Add '--force' to force to renew.

Closing the issue