example compose and env docs

.env.example

@@ -0,0 +1,23 @@
+# copy this to .env and fill in your own values
+
+# the public address of your instance
+INSTANCE_URL=https://crosswords.example.com
+CORS_ORIGIN=https://crosswords.example.com
+
+# webauthn / passkeys
+RP_ID=crosswords.example.com
+RP_ORIGIN=https://crosswords.example.com
+
+# activitypub federation
+AP_DOMAIN=crosswords.example.com
+AP_ACTOR_NAME=cruciverb
+
+# host port for the puzzle page
+PORT=8484
+
+# set to true when nginx/caddy sits in front and sets x-forwarded-for
+TRUST_PROXY=false
+
+# at-rest encryption for user data - generate one with
+#   openssl rand -hex 32
+DATA_ENC_KEY=