Initial db migrations (forgor in last PR)

Forgor to `git add -N` the migration files in last PR sorry!

.env.example

···
+# shitsky saves state here
+DATABASE_URL=postgres://postgres:postgres@localhost:5432/shitsky
+
+# shitsky is only going to care about the social circles of the users in these PDSes:
+PDS_LIST=pds.witchcraft.systems,pds.upcloud.world

.gitignore

···
 /target
 /.sqlx
+.env

migrations/20251004130559_create_firehose_table.down.sql

···
+DROP TABLE firehose_messages;

migrations/20251004130559_create_firehose_table.up.sql

···
+CREATE TABLE firehose_messages (
+    created_at TIMESTAMP NOT NULL DEFAULT NOW(),
+    message JSONB NOT NULL
+);

src/firehose.rs

···
                         break;
                     },
                     Ok(Some(Ok(msg))) => {
-                         if let Message::Binary(data) = msg {
+                        if let Message::Binary(data) = msg {
                             let mut deserializer = serde_ipld_dagcbor::de::Deserializer::from_slice(&data);
                             let map_cbor_err = |e: serde_ipld_dagcbor::DecodeError<std::convert::Infallible>| {
                                 std::io::Error::other(e.to_string())

src/main.rs

···
     tracing::info!("Starting firehose subscriber...");
 
     let options = FirehoseOptions {
-        relay_url: "wss://relay.upcloud.world".to_string(),
+        relay_url: "wss://bsky.network".to_string(),
         ..Default::default()
     };