chore(piepline): add runtime package.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

runtime/runtime.go

@@ -0,0 +1,40 @@
+package runtime
+
+import (
+	"context"
+
+	v1 "gitea.com/gitea/proto/gen/proto/v1"
+	"gitea.com/gitea/act_runner/client"
+
+	"github.com/sirupsen/logrus"
+)
+
+// Runner runs the pipeline.
+type Runner struct {
+	Machine string
+	Environ map[string]string
+	Client  client.Client
+}
+
+// Run runs the pipeline stage.
+func (s *Runner) Run(ctx context.Context, stage *v1.Stage) error {
+	l := logrus.
+		WithField("stage.build_uuid", stage.BuildUuid).
+		WithField("stage.runner_uuid", stage.RunnerUuid)
+
+	l.Info("stage received")
+	// TODO: Update stage structure
+
+	return s.run(ctx, stage)
+}
+
+func (s *Runner) run(ctx context.Context, stage *v1.Stage) error {
+	l := logrus.
+		WithField("stage.build_uuid", stage.BuildUuid).
+		WithField("stage.runner_uuid", stage.RunnerUuid)
+
+	l.Info("start running pipeline")
+	// TODO: docker runner with stage data
+
+	return nil
+}