release: 0.1.0: Phases 0-11: panel, Postfix/DKIM, milter, backup, Docker image

Initial feature-complete implementation of the v1.0 specification (phases 0-11 of `docs/implementation-plan.md`).
Added:
  - Panel (Go, single static binary) with SQLite persistence, one-time
  - Domain management with per-domain DKIM (RSA-2048, generated in pure Go) and
  - Application (sender identity) management: SASL credentials via `sasldb2`,
  - Full Postfix relay config generated from env at container start: SMTPS 465,
  - Journal milter (pure Go, `go-milter`) recording every send to `send_log`;
  … (6 more in CHANGELOG)

Full detail: CHANGELOG.md (0.1.0).

deploy/nginx/nginx.conf.example

@@ -0,0 +1,32 @@
+# nginx vhost for the SelfPost panel (spec 10.3). Proxies HTTPS to the panel
+# over the compose network; mail (465/587) is published directly by the
+# selfpost container and never touches nginx.
+
+server {
+	listen 80;
+	server_name mail.example.com;
+
+	location /.well-known/acme-challenge/ {
+		root /var/www/certbot;
+	}
+
+	location / {
+		return 301 https://$host$request_uri;
+	}
+}
+
+server {
+	listen 443 ssl;
+	http2 on;
+	server_name mail.example.com;
+
+	ssl_certificate     /etc/letsencrypt/live/mail.example.com/fullchain.pem;
+	ssl_certificate_key /etc/letsencrypt/live/mail.example.com/privkey.pem;
+
+	location / {
+		proxy_pass http://selfpost:8080;
+		proxy_set_header Host $host;
+		proxy_set_header X-Forwarded-Proto $scheme;
+		proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+	}
+}