Add support for postgres 13

roles/matrix-postgres/defaults/main.yml

@@ -12,7 +12,8 @@ matrix_postgres_docker_image_v9: "postgres:9.6.19-alpine"
 matrix_postgres_docker_image_v10: "postgres:10.14-alpine"
 matrix_postgres_docker_image_v11: "postgres:11.9-alpine"
 matrix_postgres_docker_image_v12: "postgres:12.4-alpine"
-matrix_postgres_docker_image_latest: "{{ matrix_postgres_docker_image_v12 }}"
+matrix_postgres_docker_image_v13: "postgres:13.0-alpine"
+matrix_postgres_docker_image_latest: "{{ matrix_postgres_docker_image_v13 }}"
 
 # This variable is assigned at runtime. Overriding its value has no effect.
 matrix_postgres_docker_image_to_use: '{{ matrix_postgres_docker_image_latest }}'

roles/matrix-postgres/tasks/util/detect_existing_postgres_version.yml

@@ -49,3 +49,8 @@
   set_fact:
     matrix_postgres_detected_version_corresponding_docker_image: "{{ matrix_postgres_docker_image_v11 }}"
   when: "matrix_postgres_detected_version == '11' or matrix_postgres_detected_version.startswith('11.')"
+
+- name: Determine corresponding Docker image to detected version (use 12.x, if detected)
+  set_fact:
+    matrix_postgres_detected_version_corresponding_docker_image: "{{ matrix_postgres_docker_image_v12 }}"
+  when: "matrix_postgres_detected_version == '12' or matrix_postgres_detected_version.startswith('12.')"