Add basic vaultwarden installation

vaultwarden/vaultwarden_sample_haproxy

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+# The `upstream` directives ensure that you have a http/1.1 connection
+# This enables the keepalive option and better performance
+#
+# Define the server IP and ports here.
+upstream vaultwarden-default {
+  zone vaultwarden-default 64k;
+  server 127.0.0.1:8885;
+  keepalive 2;
+}
+
+# Needed to support websocket connections
+# See: https://nginx.org/en/docs/http/websocket.html
+# Instead of "close" as stated in the above link we send an empty value.
+# Else all keepalive connections will not work.
+map $http_upgrade $connection_upgrade {
+    default upgrade;
+    ''      "";
+}
+
+# Redirect HTTP to HTTPS
+# server {
+#     listen 80;
+#     listen [::]:80;
+#     server_name my_domain.tld;
+
+#     return 301 https://$host$request_uri;
+# }
+
+server {
+    # For older versions of nginx appended http2 to the listen line after ssl and remove `http2 on`
+    listen 127.0.0.1:80;
+    # listen [::]:80;
+    # server_name my_domain.tld;
+
+    # Specify SSL Config when needed
+    # ssl_certificate /path/to/certificate/letsencrypt/live/vaultwarden.example.tld/fullchain.pem;
+    # ssl_certificate_key /path/to/certificate/letsencrypt/live/vaultwarden.example.tld/privkey.pem;
+    # ssl_trusted_certificate /path/to/certificate/letsencrypt/live/vaultwarden.example.tld/fullchain.pem;
+    #add_header Strict-Transport-Security "max-age=31536000;";
+
+    client_max_body_size 525M;
+
+    proxy_http_version 1.1;
+    proxy_set_header Upgrade $http_upgrade;
+    proxy_set_header Connection $connection_upgrade;
+
+    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;
+
+    location / {
+      proxy_pass http://vaultwarden-default;
+    }
+
+    # Optionally add extra authentication besides the ADMIN_TOKEN
+    # Remove the comments below `#` and create the htpasswd_file to have it active
+    #
+    #location /admin {
+    #  # See: https://docs.nginx.com/nginx/admin-guide/security-controls/configuring-http-basic-authentication/
+    #  auth_basic "Private";
+    #  auth_basic_user_file /path/to/htpasswd_file;
+    #
+    #  proxy_pass http://vaultwarden-default;
+    #}
+}