chore(gitlab): debug services

snippets/check-port-is-reachable.sh

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+#!sh
+
+# Sources:
+# - https://superuser.com/questions/621870/test-if-a-port-on-a-remote-system-is-reachable-without-telnet
+
+# TCP
+
+nc -vz  -w '3' 'localhost' '80'
+nc -nvz -w '3' '127.0.0.1' '80'
+
+timeout '3' cat < '/dev/tcp/localhost/80'
+timeout '3' cat < '/dev/tcp/127.0.0.1/80'
+
+
+# UDP
+
+nc -uvz  -w '3' 'localhost' '25'
+nc -nuvz -w '3' '127.0.0.1' '25'
+
+timeout '3' cat < '/dev/udp/localhost/80'
+timeout '3' cat < '/dev/udp/127.0.0.1/25'

snippets/gitlab.task.print-service-logs.yml

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+---
+
+print-postgis-service-logs:
+  when: manual
+  variables:
+    CI_DEBUG_SERVICES: "true"
+  services:
+    - name: "postgis/postgis:15-3.3"
+      alias: db
+      variables:
+        POSTGRES_DB: postgres
+        POSTGRES_USER: postgres
+        POSTGRES_PASSWORD: "postgres"
+        POSTGRES_HOST_AUTH_METHOD: trust
+  script:
+    - echo 'hello!!'