chore(deps): pin dependencies

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

@@ -3,7 +3,7 @@
 
 services:
   database:
-    image: docker.io/library/postgres:15-alpine
+    image: docker.io/library/postgres:15-alpine@sha256:6bd113a3de3274beda0f056ebf0d75cf060dc4a493b72bea6f9d810dce63f897
     environment:
       - "POSTGRES_USER=pretalx"
       - "POSTGRES_PASSWORD={{ secret__pretalx_db_password }}"
@@ -15,7 +15,7 @@ services:
       - pretalx_net
 
   redis:
-    image: redis:latest
+    image: redis:latest@sha256:4521b581dbddea6e7d81f8fe95ede93f5648aaa66a9dacd581611bf6fe7527bd
     restart: unless-stopped
     volumes:
       - redis:/data
@@ -23,7 +23,7 @@ services:
       - pretalx_net
 
   static:
-    image: docker.io/library/nginx
+    image: docker.io/library/nginx@sha256:029d4461bd98f124e531380505ceea2072418fdf28752aa73b7b273ba3048903
     restart: unless-stopped
     volumes:
       - public:/usr/share/nginx/html
@@ -33,7 +33,7 @@ services:
       - pretalx_net
 
   pretalx:
-    image: pretalx/standalone:latest
+    image: pretalx/standalone:latest@sha256:fb2d15f11bcae8bb15430084ed81a150cfdf7c79705450583b51e352ba486e8e
     entrypoint: gunicorn
     command:
       - "pretalx.wsgi"
@@ -78,7 +78,7 @@ services:
       - pretalx_net
 
   celery:
-    image: pretalx/standalone:latest
+    image: pretalx/standalone:latest@sha256:fb2d15f11bcae8bb15430084ed81a150cfdf7c79705450583b51e352ba486e8e
     command:
       - taskworker
     restart: unless-stopped