Run SQLx migrations on startup

migrations/20240101000004_create_users_languages.sql

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+-- Create users_languages table
+CREATE TABLE IF NOT EXISTS users_languages (
+    id SERIAL PRIMARY KEY,
+    language INTEGER NOT NULL,
+    "user" INTEGER NOT NULL
+);
+
+-- Add foreign key constraints if they don't exist
+DO $$
+BEGIN
+    IF NOT EXISTS (
+        SELECT 1 FROM pg_constraint
+        WHERE conname = 'fk_users_languages_languages_language_id'
+    ) THEN
+        ALTER TABLE users_languages
+        ADD CONSTRAINT fk_users_languages_languages_language_id
+        FOREIGN KEY (language) REFERENCES languages(id)
+        ON UPDATE CASCADE ON DELETE CASCADE;
+    END IF;
+END $$;
+
+DO $$
+BEGIN
+    IF NOT EXISTS (
+        SELECT 1 FROM pg_constraint
+        WHERE conname = 'fk_users_languages_user_settings_user_id'
+    ) THEN
+        ALTER TABLE users_languages
+        ADD CONSTRAINT fk_users_languages_user_settings_user_id
+        FOREIGN KEY ("user") REFERENCES user_settings(id)
+        ON UPDATE CASCADE ON DELETE CASCADE;
+    END IF;
+END $$;