The workload is on https, but traefik still thinks it's http

[sed-i]

Bug Description

In a cos-lite bundle deployment, the workload is on https, but traefik still thinks it's http.

To Reproduce

Run integration tests from canonical/cos-lite-bundle#80.

Environment

Model             Controller  Cloud/Region        Version  SLA          Timestamp
test-bundle-wuya  microk8s    microk8s/localhost  3.1.5    unsupported  22:56:30-04:00

App           Version  Status  Scale  Charm                     Channel  Rev  Address         Exposed  Message
alertmanager  0.25.0   active      2  alertmanager-k8s          edge      91  10.152.183.20   no       
avalanche              active      2  avalanche-k8s             edge      35  10.152.183.105  no       
ca                     active      1  self-signed-certificates  edge      36  10.152.183.125  no       
catalogue              active      1  catalogue-k8s             edge      27  10.152.183.227  no       
external-ca            active      1  self-signed-certificates  edge      36  10.152.183.218  no       
grafana       9.2.1    active      1  grafana-k8s               edge      92  10.152.183.21   no       
loki          2.7.4    active      1  loki-k8s                  edge      99  10.152.183.129  no       
prometheus    2.46.0   active      1  prometheus-k8s            edge     149  10.152.183.159  no       
traefik       2.10.4   active      1  traefik-k8s               edge     155  10.43.8.206     no       

Relevant log output

$ ps aux | grep prometheus                                                                         
root      764181  0.1  1.2 933536 91252 ?        Sl   22:03   0:04 /bin/prometheus --config.file=/etc/prometheus/prometheus.yml --storage.tsdb.path=/var/lib/prometheus --web.enable-lifecycle --web.console.templates=/usr/share/prometheus/consoles --web.console.libraries=/usr/share/prometheus/console_libraries --web.config.file=/etc/prometheus/prometheus-web-config.yml --web.external-url=https://prometheus-0.prometheus-endpoints.test-bundle-wuya.svc.cluster.local:9090/test-bundle-wuya-prometheus-0 --web.route-prefix=/ --log.level=info --storage.tsdb.retention.time=15d --storage.tsdb.retention.size=0.8GB

$ jsshc traefik traefik/0 cat /opt/traefik/juju/juju_ingress_ingress-per-unit_8_prometheus.yaml
http:
  middlewares:
    juju-sidecar-noprefix-test-bundle-wuya-prometheus-0:
      stripPrefix:
        forceSlash: false
        prefixes:
        - /test-bundle-wuya-prometheus-0
  routers:
    juju-test-bundle-wuya-prometheus-0-router:
      entryPoints:
      - web
      middlewares:
      - juju-sidecar-noprefix-test-bundle-wuya-prometheus-0
      rule: PathPrefix(`/test-bundle-wuya-prometheus-0`)
      service: juju-test-bundle-wuya-prometheus-0-service
    juju-test-bundle-wuya-prometheus-0-router-tls:
      entryPoints:
      - websecure
      middlewares:
      - juju-sidecar-noprefix-test-bundle-wuya-prometheus-0
      rule: PathPrefix(`/test-bundle-wuya-prometheus-0`)
      service: juju-test-bundle-wuya-prometheus-0-service
      tls: {}
  services:
    juju-test-bundle-wuya-prometheus-0-service:
      loadBalancer:
        servers:
        - url: http://prometheus-0.prometheus-endpoints.test-bundle-wuya.svc.cluster.local:9090

Additional context

No response