Remove frontend and clean up unused deployment files

- Remove frontend component from CI/CD delivery pipeline
- Add pull_request trigger for PR validation (build & scan only, no deploy)
- Delete frontend Dockerfiles (frontend.Dockerfile, frontend.dev.Dockerfile)
- Remove legacy server deployment configs (crontab, cryptify.nl.conf, cryptify.service)
- Remove unused nginx configs (nginx.conf, nginx.dev.conf)
- Remove example IRMA config (irma.example.json)
- Update docker-compose files to reflect backend-only architecture

Author: rubenhensen

.github/workflows/delivery.yml

@@ -7,6 +7,8 @@ concurrency:
 on:
   push:
     branches: [ main ]
+  pull_request:
+    branches: [ main ]
   release:
     # Note: a current limitation is that when a release is edited after publication, then the Docker tags are not automatically updated.
     types: [ published ]
@@ -27,18 +29,13 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        component: [backend, frontend]
+        component: [backend]
         include:
           - component: backend
             dockerfile: backend.Dockerfile
             image_suffix: "-backend"
             local_tag: local/postguard-backend:scan
             sarif_category: backend
-          - component: frontend
-            dockerfile: frontend.Dockerfile
-            image_suffix: "-frontend"
-            local_tag: local/postguard-frontend:scan
-            sarif_category: frontend
 
     steps:
       - name: Checkout

backend.Dockerfile

@@ -1,4 +1,4 @@
-FROM rust:1.91.0-slim-trixie AS builder
+FROM rust:1.93.0-slim-trixie AS builder
 
 ENV ROCKET_PROFILE=release
 

backend.dev.Dockerfile

@@ -1,4 +1,4 @@
-FROM rust:1.91.0-slim-trixie AS chef
+FROM rust:latest-slim AS chef
 
 # Install cargo-chef for dependency caching
 RUN cargo install cargo-chef cargo-watch

conf/crontab

@@ -1,30 +1,4 @@
 services:
-  nginx:
-    image: nginx:alpine
-    container_name: nginx-dev
-    ports:
-      - "80:80"
-    volumes:
-      - "./conf/nginx.dev.conf:/etc/nginx/nginx.conf:ro"
-    depends_on:
-      - backend
-      - frontend
-    networks: [default]
-
-  frontend:
-    build:
-      context: .
-      dockerfile: frontend.dev.Dockerfile
-    container_name: frontend-dev
-    environment:
-      - REACT_APP_ENV=development
-    ports:
-      - "8080:8080"
-    volumes:
-      - "./cryptify-front-end/src:/app/src"
-      - "./cryptify-front-end/public:/app/public"
-    networks: [default]
-
   backend:
     build:
       context: .