feat(iac): establish Ansible baseline for Nginx, SearXNG, Valkey, and Certbot

- Reverse-engineer live Debian 13 (trixie) VPS state at miguelpedro.xyz.br
- Add modular Ansible roles: common, certbot, valkey, searxng, and nginx
- Encrypt SearXNG secret_key using ansible-vault in group_vars/all/vault.yml
- Cleanly remove unused example.com Nginx stub symlink (sites-enabled/miguelpedro.xyz.br)
- Scaffold cgit + fcgiwrap role (cgit_enabled: false) for upcoming deployment
- Add DISCOVERY_REPORT.md, COMMAND_LOG.md, README.md, and AGENT_INSTRUCTIONS.md with Self-Updating Protocol

1 files changed, 84 insertions, 0 deletions

diff --git a/roles/nginx/templates/nginx.conf.j2 b/roles/nginx/templates/nginx.conf.j2
new file mode 100644
index 0000000..68a8fd4
--- /dev/null
+++ b/roles/nginx/templates/nginx.conf.j2
@@ -0,0 +1,84 @@
+user www-data;
+worker_processes auto;
+worker_cpu_affinity auto;
+pid /run/nginx.pid;
+error_log /var/log/nginx/error.log;
+include /etc/nginx/modules-enabled/*.conf;
+
+events {
+	worker_connections 768;
+	# multi_accept on;
+}
+
+http {
+
+	##
+	# Basic Settings
+	##
+
+	sendfile on;
+	tcp_nopush on;
+	types_hash_max_size 2048;
+	server_tokens off; # Recommended practice is to turn this off
+
+	# server_names_hash_bucket_size 64;
+	# server_name_in_redirect off;
+
+	include /etc/nginx/mime.types;
+	default_type application/octet-stream;
+
+	##
+	# SSL Settings
+	##
+
+	ssl_protocols TLSv1.2 TLSv1.3; # Dropping SSLv3 (POODLE), TLS 1.0, 1.1
+	ssl_prefer_server_ciphers off; # Don't force server cipher order.
+
+	##
+	# Logging Settings
+	##
+
+	access_log /var/log/nginx/access.log;
+
+	##
+	# Gzip Settings
+	##
+
+	gzip on;
+
+	# gzip_vary on;
+	# gzip_proxied any;
+	# gzip_comp_level 6;
+	# gzip_buffers 16 8k;
+	# gzip_http_version 1.1;
+	# gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
+
+	##
+	# Virtual Host Configs
+	##
+
+	include /etc/nginx/conf.d/*.conf;
+	include /etc/nginx/sites-enabled/*;
+}
+
+
+#mail {
+#	# See sample authentication script at:
+#	# http://wiki.nginx.org/ImapAuthenticateWithApachePhpScript
+#
+#	# auth_http localhost/auth.php;
+#	# pop3_capabilities "TOP" "USER";
+#	# imap_capabilities "IMAP4rev1" "UIDPLUS";
+#
+#	server {
+#		listen     localhost:110;
+#		protocol   pop3;
+#		proxy      on;
+#	}
+#
+#	server {
+#		listen     localhost:143;
+#		protocol   imap;
+#		proxy      on;
+#	}
+#}