feat(impl): Add database client and migration functionality

Implement connection to PostgreSQL database using GORM. Embed SQL migrations and handle migration execution with logging capabilities. Define configuration structure for database settings.

pkg/database/client.go

@@ -0,0 +1,68 @@
+package database
+
+import (
+	"context"
+	"embed"
+	"fmt"
+	"git.anthrove.art/Anthrove/otter-space-sdk/v2/pkg/models"
+	migrate "github.com/rubenv/sql-migrate"
+	log "github.com/sirupsen/logrus"
+	"gorm.io/driver/postgres"
+	"gorm.io/gorm"
+)
+
+//go:embed migrations/*.sql
+var embedMigrations embed.FS
+var client *gorm.DB
+
+func Connect(_ context.Context, config models.DatabaseConfig) error {
+	var localSSL string
+
+	if config.SSL {
+		localSSL = "require"
+	} else {
+		localSSL = "disable"
+	}
+
+	dsn := fmt.Sprintf("host=%s user=%s password=%s dbname=%s port=%d sslmode=%s TimeZone=%s", config.Endpoint, config.Username, config.Password, config.Database, config.Port, localSSL, config.Timezone)
+	sqlDB, err := gorm.Open(postgres.Open(dsn), &gorm.Config{})
+
+	if err != nil {
+		return err
+	}
+
+	client = sqlDB
+	err = migrateDatabase(sqlDB, config)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func migrateDatabase(dbPool *gorm.DB, config models.DatabaseConfig) error {
+	dialect := "postgres"
+	migrations := &migrate.EmbedFileSystemMigrationSource{FileSystem: embedMigrations, Root: "migrations"}
+
+	db, err := dbPool.DB()
+	if err != nil {
+		return fmt.Errorf("postgres migration: %v", err)
+	}
+
+	n, err := migrate.Exec(db, dialect, migrations, migrate.Up)
+	if err != nil {
+		return fmt.Errorf("postgres migration: %v", err)
+	}
+
+	if config.Debug {
+		if n != 0 {
+			log.Infof("postgres migration: applied %d migrations!", n)
+
+		} else {
+			log.Info("postgres migration: nothing to migrate")
+
+		}
+	}
+
+	return nil
+}