Add astro stack for e.field.ghost.tel

stacks/astro/.env.template

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+DOMAIN=${DOMAIN}

stacks/astro/docker-compose.yml

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+services:
+  astro:
+    image: nginx:alpine
+    container_name: astro
+    restart: unless-stopped
+    expose:
+      - 80
+    volumes:
+      - ./dist:/usr/share/nginx/html:ro
+      - ./nginx-cors.conf:/etc/nginx/conf.d/default.conf:ro
+    networks:
+      - web
+    labels:
+      - "com.ghost.tel/stack-type=public"
+      - "traefik.enable=true"
+      - "traefik.http.routers.astro.entrypoints=https"
+      - "traefik.http.routers.astro.rule=Host(`e.field.${DOMAIN}`)"
+      - "traefik.http.routers.astro.tls.certresolver=http"
+      - "traefik.http.services.astro.loadbalancer.server.port=80"
+
+networks:
+  web:
+    external: true

stacks/astro/nginx-cors.conf

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+server {
+    listen 80;
+
+    location / {
+        root   /usr/share/nginx/html;
+        index  index.html index.htm;
+
+        # CORS configuration
+        add_header 'Access-Control-Allow-Origin' '*' always;
+        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS' always;
+        add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range' always;
+        add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range' always;
+
+        # Handle preflight requests
+        if ($request_method = 'OPTIONS') {
+            add_header 'Access-Control-Allow-Origin' '*';
+            add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
+            add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
+            add_header 'Access-Control-Max-Age' 1728000;
+            add_header 'Content-Type' 'text/plain; charset=utf-8';
+            add_header 'Content-Length' 0;
+            return 204;
+        }
+
+        try_files $uri $uri/ =404;
+    }
+}