fix: extract and create external Docker networks from compose files

- Extract external networks from docker-compose.base.yml and compose override files
- Extract network names from 'name:' fields when external: true
- Create all required external networks before docker compose up
- Fixes error: 'network postgres-staging-internal declared as external, but could not be found'

This ensures all external networks (traefik-public, app-internal, postgres-staging-internal, etc.)
are created before attempting to start containers.

deployment/ansible/playbooks/deploy-image.yml

@@ -259,13 +259,47 @@
       failed_when: false
       changed_when: compose_update_alt.changed | default(false)
 
+    - name: Extract external networks from docker-compose files
+      ansible.builtin.shell: |
+        cd {{ application_code_dest }}
+        grep -h "external:" docker-compose.base.yml docker-compose.{{ application_compose_suffix }} 2>/dev/null | \
+        grep -B 5 "external: true" | \
+        grep -E "^\s+[a-zA-Z0-9_-]+:" | \
+        sed 's/://' | \
+        sed 's/^[[:space:]]*//' | \
+        sort -u || echo ""
+      register: external_networks_raw
+      changed_when: false
+      failed_when: false
+
+    - name: Extract external network names (with name: field)
+      ansible.builtin.shell: |
+        cd {{ application_code_dest }}
+        grep -A 2 "external: true" docker-compose.base.yml docker-compose.{{ application_compose_suffix }} 2>/dev/null | \
+        grep "name:" | \
+        sed 's/.*name:[[:space:]]*//' | \
+        sed 's/"//g' | \
+        sort -u || echo ""
+      register: external_network_names
+      changed_when: false
+      failed_when: false
+
+    - name: Set list of external networks to create
+      ansible.builtin.set_fact:
+        external_networks_to_create: >-
+          {%- set networks_from_keys = external_networks_raw.stdout | trim | split('\n') | select('match', '.+') | list -%}
+          {%- set networks_from_names = external_network_names.stdout | trim | split('\n') | select('match', '.+') | list -%}
+          {%- set all_networks = (networks_from_keys + networks_from_names) | unique | list -%}
+          {%- set default_networks = ['traefik-public', 'app-internal'] -%}
+          {%- set final_networks = (all_networks + default_networks) | unique | list -%}
+          {{ final_networks }}
+
     - name: Ensure Docker networks exist
       community.docker.docker_network:
         name: "{{ item }}"
         state: present
-      loop:
+        driver: bridge
-        - traefik-public
+      loop: "{{ external_networks_to_create | default(['traefik-public', 'app-internal']) }}"
-        - app-internal
       ignore_errors: yes
 
     - name: Check if .env file exists