feat: add configuration parsing and job definitions

Add a YAML config schema for migration jobs (source/target schema, table, primary key, options) and parse it at startup.

cmd/go_migrate/job-error-handler.go

@@ -0,0 +1,47 @@
+package main
+
+import (
+	"context"
+	"fmt"
+
+	log "github.com/sirupsen/logrus"
+)
+
+type JobError struct {
+	ShouldCancelJob bool
+	Msg             string
+	Prev            error
+}
+
+func (e *JobError) Error() string {
+	if e.Prev != nil {
+		return fmt.Sprintf("%s: %v", e.Msg, e.Prev)
+	}
+
+	return e.Msg
+}
+
+func jobErrorHandler(ctx context.Context, chErrorsIn <-chan JobError) error {
+	for {
+		if ctx.Err() != nil {
+			return nil
+		}
+
+		select {
+		case <-ctx.Done():
+			return nil
+
+		case err, ok := <-chErrorsIn:
+			if !ok {
+				return nil
+			}
+
+			if err.ShouldCancelJob {
+				log.Error(err.Msg, " - ", err.Prev)
+				return &err
+			}
+
+			log.Error(err.Msg, " - ", err.Prev)
+		}
+	}
+}