Can't reach Firebase Emulator, Running in a Github Action

A Github Action Step is its own process. So in there, I have a correctly starting Firebase Emulator. But in the same (step) process, I can’t reach any of its ports, when trying to connect to it.

How can I troubleshoot and get to the root of the Firebase Emulator (or any daemon) that should be listening in a Github Action Step (its own process)?

(step) code

yarn my:alias &

echo "A"
sleep 120

echo "B"
netstat -ap tcp | grep -i "listen"

echo "C"
FIRESTORE_EMULATOR_HOST="localhost:8080" \
PUBSUB_EMULATOR_HOST="localhost:8085" \
GCLOUD_PROJECT=foobar \
clojure -M:foo/bar
shell: /usr/bin/bash -e ***0***
env:
  CLOJURE_INSTALL_DIR: /opt/hostedtoolcache/ClojureToolsDeps/1.10.1-763/x64/lib/clojure
  SSH_AUTH_SOCK: /tmp/ssh-IPyjrCU7jmpD/agent.1904
  SSH_AGENT_PID: 1905
  CLOUDSDK_METRICS_ENVIRONMENT: github-actions-setup-gcloud
  GCLOUD_PROJECT: ***
  GOOGLE_APPLICATION_CREDENTIALS: /home/runner/work/foo/bar

log

A
yarn run v1.22.11
...

┌────────────────────────────────────────────────────────────────┐
│ ✔  All emulators ready! View status and logs at localhost:4000 │
└────────────────────────────────────────────────────────────────┘

┌───────────┬────────────────┬──────────────────────────┐
│ Emulator  │ Host:Port      │ View in Emulator UI      │
├───────────┼────────────────┼──────────────────────────┤
│ Firestore │ localhost:8080 │ localhost:4000/firestore │
├───────────┼────────────────┼──────────────────────────┤
│ Pub/Sub   │ localhost:8085 │ n/a                      │
└───────────┴────────────────┴──────────────────────────┘
  Other reserved ports: 4400, 4500


B  # We SHOULD (but don't) see a process, listening on port 8080

(Not all processes could be identified, non-owned process info
 will not be shown, you would have to be root to see it all.)
tcp        0      0 localhost:4000          0.0.0.0:*               LISTEN      3666/node
tcp        0      0 localhost:4400          0.0.0.0:*               LISTEN      3601/node
tcp        0      0 localhost:4500          0.0.0.0:*               LISTEN      3601/node
tcp        0      0 0.0.0.0:8084            0.0.0.0:*               LISTEN      -
tcp        0      0 localhost:domain        0.0.0.0:*               LISTEN      -
tcp        0      0 0.0.0.0:ssh             0.0.0.0:*               LISTEN      -
tcp        0      0 localhost:38393         0.0.0.0:*               LISTEN      -
tcp        0      0 fv-az213-105.c2vz:42652 13.107.42.16:https      ESTABLISHED 1685/Runner.Listene
tcp        0      0 fv-az213-105.c2vz:42654 13.107.42.16:https      ESTABLISHED 1685/Runner.Listene
tcp6       0      0 cpu-pool.com:45411      [::]:*                  LISTEN      3613/java
tcp6       0      0 cpu-pool.com:34765      [::]:*                  LISTEN      3613/java
tcp6       0      0 cpu-pool.com:http-alt   [::]:*                  LISTEN      3613/java
tcp6       0      0 cpu-pool.com:8085       [::]:*                  LISTEN      3639/java
tcp6       0      0 [::]:ssh                [::]:*                  LISTEN      -
unix  2      [ ACC ]     STREAM     LISTENING     20733    -                    /var/snap/lxd/common/lxd/unix.socket
...