Add CI/CD build and deploy scripts, along with docker-compose, HAProxy config, and a certbot

merge hook. Set up env.example generation. Add doiuse dev dependency.

deploy/haproxy.cfg

@@ -0,0 +1,43 @@
+global
+  daemon
+  log stdout format raw local0 info
+  maxconn 2000
+
+defaults
+  mode http
+  log global
+  timeout connect 5s
+  timeout client 30s
+  timeout server 30s
+  timeout check 5s
+  retries 3
+  option httplog
+  option dontlognull
+  option redispatch
+
+frontend http
+  bind :80
+  mode http
+  
+  http-request redirect scheme https unless { ssl_fc }
+
+frontend https
+  bind :443 ssl crt /certs/fullcert.pem
+  
+  http-response set-header Strict-Transport-Security "max-age=16000000; includeSubDomains; preload;"
+  default_backend main
+
+backend main
+  balance leastconn
+  option httpchk GET /
+  http-check expect status 200
+
+  server badblocks-personal-site badblocks-personal-site:4321 check resolvers docker resolve-prefer ipv4 init-addr none
+  
+resolvers docker
+  nameserver dns1 127.0.0.11:53
+  resolve_retries 3
+  timeout resolve 1s
+  timeout retry 1s
+  hold valid	  10s
+  hold obsolete   30s