Add nginx vhost configs for reference

nginx/admin.k-boris.tech.conf

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+server {
+    server_name admin.k-boris.tech;
+
+    location = / {
+        return 301 /admin/;
+    }
+
+    location / {
+        proxy_pass http://127.0.0.1:8080;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+
+    listen [::]:443 ssl ipv6only=on; # managed by Certbot
+    listen 443 ssl; # managed by Certbot
+    ssl_certificate /etc/letsencrypt/live/admin.k-boris.tech/fullchain.pem; # managed by Certbot
+    ssl_certificate_key /etc/letsencrypt/live/admin.k-boris.tech/privkey.pem; # managed by Certbot
+    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
+    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
+
+}
+server {
+    if ($host = admin.k-boris.tech) {
+        return 301 https://$host$request_uri;
+    } # managed by Certbot
+
+
+    listen 80;
+    listen [::]:80;
+    server_name admin.k-boris.tech;
+    return 404; # managed by Certbot
+
+
+}

nginx/ci.k-boris.tech.conf

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+server {
+    server_name ci.k-boris.tech;
+
+    location / {
+        proxy_pass http://127.0.0.1:8000;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection "upgrade";
+    }
+
+    listen 443 ssl; # managed by Certbot
+    listen [::]:443 ssl; # managed by Certbot
+    ssl_certificate /etc/letsencrypt/live/git.k-boris.tech/fullchain.pem; # managed by Certbot
+    ssl_certificate_key /etc/letsencrypt/live/git.k-boris.tech/privkey.pem; # managed by Certbot
+    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
+    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
+
+}
+server {
+    if ($host = ci.k-boris.tech) {
+        return 301 https://$host$request_uri;
+    } # managed by Certbot
+
+
+    listen 80;
+    listen [::]:80;
+    server_name ci.k-boris.tech;
+    return 404; # managed by Certbot
+
+
+}

nginx/git.k-boris.tech.conf

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+server {
+    server_name git.k-boris.tech;
+
+    client_max_body_size 100m;
+
+    location / {
+        proxy_pass http://127.0.0.1:3000;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+
+    listen 443 ssl; # managed by Certbot
+    listen [::]:443 ssl; # managed by Certbot
+    ssl_certificate /etc/letsencrypt/live/git.k-boris.tech/fullchain.pem; # managed by Certbot
+    ssl_certificate_key /etc/letsencrypt/live/git.k-boris.tech/privkey.pem; # managed by Certbot
+    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
+    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
+
+}
+server {
+    if ($host = git.k-boris.tech) {
+        return 301 https://$host$request_uri;
+    } # managed by Certbot
+
+
+    listen 80;
+    listen [::]:80;
+    server_name git.k-boris.tech;
+    return 404; # managed by Certbot
+
+
+}

nginx/k-boris.tech.conf

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+server {
+    listen 80;
+    listen [::]:80;
+    server_name k-boris.tech www.k-boris.tech;
+    return 301 https://$host$request_uri;
+}
+
+server {
+    listen 443 ssl;
+    listen [::]:443 ssl;
+    server_name k-boris.tech www.k-boris.tech;
+
+    ssl_certificate     /etc/letsencrypt/live/k-boris.tech/fullchain.pem;
+    ssl_certificate_key /etc/letsencrypt/live/k-boris.tech/privkey.pem;
+    include /etc/letsencrypt/options-ssl-nginx.conf;
+    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;
+
+    client_max_body_size 10m;
+
+    # Block admin from main domain — redirect to admin subdomain
+    location /admin/ {
+        return 301 https://admin.k-boris.tech$request_uri;
+    }
+
+    location / {
+        proxy_pass http://127.0.0.1:8080;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+}