fix(svc-db-postgres): pin Postgres version to 17-3.5, add entity_name var, and dynamically resolve major version for dev package

- Changed default Docker image version from 'latest' to '17-3.5' in config
- Introduced entity_name var for consistent lookups
- Added POSTGRES_VERSION and POSTGRES_VERSION_MAJOR extraction
- Updated Dockerfile to install postgresql-server-dev-<major> with default fallback to 'all'
- Minor YAML formatting improvements

Ref: https://chatgpt.com/share/68de40b4-2eb8-800f-ab5b-11cc873c3604

roles/svc-db-postgres/config/main.yml

@@ -6,7 +6,7 @@ docker:
       name:               postgres
       # Please set an version in your inventory file! 
       # Rolling release isn't recommended
-      version:            "latest"
+      version:            "17-3.5"
       backup:
         database_routine: true
       cpus:               "2.0"
@@ -14,5 +14,5 @@ docker:
       mem_limit:          "6g"
       pids_limit:         1024
   volumes:
-    data:     "postgres_data"
-  network:    "postgres"
+    data:                 "postgres_data"
+  network:                "postgres"

roles/svc-db-postgres/templates/Dockerfile.j2

@@ -5,7 +5,7 @@ RUN apt-get update \
  && apt-get install -y --no-install-recommends \
       build-essential \
       git \
-      postgresql-server-dev-all \
+      postgresql-server-dev-{{ POSTGRES_VERSION_MAJOR | default('all', true) }} \
  && git clone https://github.com/pgvector/pgvector.git /tmp/pgvector \
  && cd /tmp/pgvector \
  && make \

roles/svc-db-postgres/vars/main.yml

@@ -1,5 +1,6 @@
 # General
 application_id:                           svc-db-postgres
+entity_name:                              "{{ application_id | get_entity_name }}"
 
 # Docker
 docker_compose_flush_handlers:            true
@@ -9,11 +10,12 @@ database_type:                            "{{ application_id | get_entity_name }
 
 ## Postgres
 POSTGRES_VOLUME:                          "{{ applications | get_app_conf(application_id, 'docker.volumes.data') }}"
-POSTGRES_CONTAINER:                       "{{ applications | get_app_conf(application_id, 'docker.services.postgres.name') }}"
-POSTGRES_IMAGE:                           "{{ applications | get_app_conf(application_id, 'docker.services.postgres.image') }}"
-POSTGRES_SUBNET:                          "{{ networks.local['svc-db-postgres'].subnet }}"
+POSTGRES_CONTAINER:                       "{{ applications | get_app_conf(application_id, 'docker.services.' ~ entity_name ~ '.name') }}"
+POSTGRES_IMAGE:                           "{{ applications | get_app_conf(application_id, 'docker.services.' ~ entity_name ~ '.image') }}"
+POSTGRES_VERSION:                         "{{ applications | get_app_conf(application_id, 'docker.services.' ~ entity_name ~ '.version') }}"
+POSTGRES_VERSION_MAJOR:                   "{{ POSTGRES_VERSION | regex_replace('^([0-9]+).*', '\\1') }}"
 POSTGRES_NETWORK_NAME:                    "{{ applications | get_app_conf(application_id, 'docker.network') }}"
-POSTGRES_VERSION:                         "{{ applications | get_app_conf(application_id, 'docker.services.postgres.version') }}"
+POSTGRES_SUBNET:                          "{{ networks.local['svc-db-postgres'].subnet }}"
 POSTGRES_PASSWORD:                        "{{ applications | get_app_conf(application_id, 'credentials.POSTGRES_PASSWORD') }}"
 POSTGRES_PORT:                            "{{ database_port | default(ports.localhost.database[ application_id ]) }}"
 POSTGRES_INIT:                            "{{ database_username is defined and database_password is defined and database_name is defined }}"