Update docker.io/library/postgres Docker tag to v18

Use this configuration to always have the fast-forward option.

https://docs.renovatebot.com/presets-default/#rebasestaleprs

renovate.json

@@ -4,7 +4,9 @@
     "config:recommended", // Included in config:best-practices anyway, but added for clarity.
     "config:best-practices",
     ":ignoreUnstable",
-    ":disableRateLimiting"
+    ":disableRateLimiting",
+    ":rebaseStalePrs",
+    ":label(renovate)"
   ],
   "semanticCommits": "disabled",
   "packageRules": [

resources/chaosknoten/keycloak/docker_compose/compose.yaml.j2

@@ -46,7 +46,7 @@ services:
       - "8080:8080"
 
   db:
-    image: docker.io/library/postgres:15.14@sha256:9541969afa16d1ac724e16d1cf3c26ddd0c5bae5dd1c230118a7f5b9c14cde1f
+    image: docker.io/library/postgres:18.0@sha256:1ffc019dae94eca6b09a49ca67d37398951346de3c3d0cfe23d8d4ca33da83fb
     restart: unless-stopped
     networks:
       - keycloak

resources/chaosknoten/lists/docker_compose/compose.yaml

@@ -56,7 +56,7 @@ services:
       - POSTGRES_DB=mailmandb
       - POSTGRES_USER=mailman
       - POSTGRES_PASSWORD=wvQjbMRnwFuxGEPz
-    image: docker.io/library/postgres:12-alpine@sha256:7c8f4870583184ebadf7f17a6513620aac5f365a7938dc6a6911c1d5df2f481a
+    image: docker.io/library/postgres:18-alpine@sha256:48c8ad3a7284b82be4482a52076d47d879fd6fb084a1cbfccbd551f9331b0e40
     volumes:
       - /opt/mailman/database:/var/lib/postgresql/data
     networks:

resources/chaosknoten/pad/docker_compose/compose.yaml.j2

@@ -3,7 +3,7 @@
 
 services:
   database:
-    image: docker.io/library/postgres:15-alpine@sha256:2e50ad404aead120409575d21758230cc295aec52dfa05ece9b4d0429bc38636
+    image: docker.io/library/postgres:18-alpine@sha256:48c8ad3a7284b82be4482a52076d47d879fd6fb084a1cbfccbd551f9331b0e40
     environment:
       - "POSTGRES_USER=hedgedoc"
       - "POSTGRES_PASSWORD={{ secret__hedgedoc_db_password }}"

resources/chaosknoten/pretalx/docker_compose/compose.yaml.j2

@@ -3,7 +3,7 @@
 
 services:
   database:
-    image: docker.io/library/postgres:15-alpine@sha256:2e50ad404aead120409575d21758230cc295aec52dfa05ece9b4d0429bc38636
+    image: docker.io/library/postgres:18-alpine@sha256:48c8ad3a7284b82be4482a52076d47d879fd6fb084a1cbfccbd551f9331b0e40
     environment:
       - "POSTGRES_USER=pretalx"
       - "POSTGRES_PASSWORD={{ secret__pretalx_db_password }}"

resources/chaosknoten/tickets/docker_compose/compose.yaml.j2

@@ -1,7 +1,7 @@
 ---
 services:
   database:
-    image: docker.io/library/postgres:15-alpine@sha256:2e50ad404aead120409575d21758230cc295aec52dfa05ece9b4d0429bc38636
+    image: docker.io/library/postgres:18-alpine@sha256:48c8ad3a7284b82be4482a52076d47d879fd6fb084a1cbfccbd551f9331b0e40
     environment:
       - "POSTGRES_USER=pretix"
       - "POSTGRES_PASSWORD={{ secret__pretix_db_password }}"