initial public relay build repo

.env.example

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+# Nosterm relay deployment configuration.
+# Copy to `.env` and adjust.
+
+# Stable 64-char hex identity that signs group metadata/rosters.
+# REQUIRED when RELAY_ENV=production (the relay refuses to start without it).
+# In dev it is auto-generated and persisted to the data volume.
+# Generate one with:  openssl rand -hex 32
+RELAY_SECRET_KEY=
+
+# Set to "production" to require a stable RELAY_SECRET_KEY (fail-fast if unset).
+# Leave empty for development (auto-generates + persists a key).
+RELAY_ENV=
+
+# NIP-11 relay metadata.
+RELAY_NAME=Nosterm Home Relay
+RELAY_DESCRIPTION=
+RELAY_CONTACT=relay@nosterm.com
+
+# Optional message-of-the-day: shown in the client's relay "server window" on
+# connect (IRC-style MOTD). Multi-line supported with \n. Empty = falls back to
+# the built-in "nerdworks.io" ascii banner.
+RELAY_MOTD=
+
+# Retention (chat messages only; membership/metadata are never pruned).
+# 0 = unlimited.
+RELAY_RETENTION_DAYS=0
+RELAY_RETENTION_MAX_MESSAGES=0
+RELAY_RETENTION_INTERVAL_MINUTES=60
+
+# Optional federation with peer relays. Empty = disabled.
+# Format: "<wss-url>[|<mode>:<channels>]" entries separated by ';'.
+#   mode     = mirror (bidirectional) | ingest (read-only). Default mirror.
+#   channels = comma list of group ids, or '*' for all. Default '*'.
+# Example:
+#   wss://a.example|mirror:general,dev;wss://b.example|ingest:*
+RELAY_FEDERATION_PEERS=