Implement actions artifacts (#22738)

Implement action artifacts server api.

This change is used for supporting
https://github.com/actions/upload-artifact and
https://github.com/actions/download-artifact in gitea actions. It can
run sample workflow from doc
https://docs.github.com/en/actions/using-workflows/storing-workflow-data-as-artifacts.
The api design is inspired by
https://github.com/nektos/act/blob/master/pkg/artifacts/server.go and
includes some changes from gitea internal structs and methods.

Actions artifacts contains two parts:

- Gitea server api and storage (this pr implement basic design without
some complex cases supports)
- Runner communicate with gitea server api (in comming)

Old pr https://github.com/go-gitea/gitea/pull/22345 is outdated after
actions merged. I create new pr from main branch.


![897f7694-3e0f-4f7c-bb4b-9936624ead45](https://user-images.githubusercontent.com/2142787/219382371-eb3cf810-e4e0-456b-a8ff-aecc2b1a1032.jpeg)

Add artifacts list in actions workflow page.

models/actions/artifact.go

@@ -0,0 +1,122 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+// This artifact server is inspired by https://github.com/nektos/act/blob/master/pkg/artifacts/server.go.
+// It updates url setting and uses ObjectStore to handle artifacts persistence.
+
+package actions
+
+import (
+	"context"
+	"errors"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/modules/timeutil"
+	"code.gitea.io/gitea/modules/util"
+)
+
+const (
+	// ArtifactStatusUploadPending is the status of an artifact upload that is pending
+	ArtifactStatusUploadPending = 1
+	// ArtifactStatusUploadConfirmed is the status of an artifact upload that is confirmed
+	ArtifactStatusUploadConfirmed = 2
+	// ArtifactStatusUploadError is the status of an artifact upload that is errored
+	ArtifactStatusUploadError = 3
+)
+
+func init() {
+	db.RegisterModel(new(ActionArtifact))
+}
+
+// ActionArtifact is a file that is stored in the artifact storage.
+type ActionArtifact struct {
+	ID                 int64 `xorm:"pk autoincr"`
+	RunID              int64 `xorm:"index UNIQUE(runid_name)"` // The run id of the artifact
+	RunnerID           int64
+	RepoID             int64 `xorm:"index"`
+	OwnerID            int64
+	CommitSHA          string
+	StoragePath        string             // The path to the artifact in the storage
+	FileSize           int64              // The size of the artifact in bytes
+	FileCompressedSize int64              // The size of the artifact in bytes after gzip compression
+	ContentEncoding    string             // The content encoding of the artifact
+	ArtifactPath       string             // The path to the artifact when runner uploads it
+	ArtifactName       string             `xorm:"UNIQUE(runid_name)"` // The name of the artifact when runner uploads it
+	Status             int64              `xorm:"index"`              // The status of the artifact, uploading, expired or need-delete
+	CreatedUnix        timeutil.TimeStamp `xorm:"created"`
+	UpdatedUnix        timeutil.TimeStamp `xorm:"updated index"`
+}
+
+// CreateArtifact create a new artifact with task info or get same named artifact in the same run
+func CreateArtifact(ctx context.Context, t *ActionTask, artifactName string) (*ActionArtifact, error) {
+	if err := t.LoadJob(ctx); err != nil {
+		return nil, err
+	}
+	artifact, err := getArtifactByArtifactName(ctx, t.Job.RunID, artifactName)
+	if errors.Is(err, util.ErrNotExist) {
+		artifact := &ActionArtifact{
+			RunID:     t.Job.RunID,
+			RunnerID:  t.RunnerID,
+			RepoID:    t.RepoID,
+			OwnerID:   t.OwnerID,
+			CommitSHA: t.CommitSHA,
+			Status:    ArtifactStatusUploadPending,
+		}
+		if _, err := db.GetEngine(ctx).Insert(artifact); err != nil {
+			return nil, err
+		}
+		return artifact, nil
+	} else if err != nil {
+		return nil, err
+	}
+	return artifact, nil
+}
+
+func getArtifactByArtifactName(ctx context.Context, runID int64, name string) (*ActionArtifact, error) {
+	var art ActionArtifact
+	has, err := db.GetEngine(ctx).Where("run_id = ? AND artifact_name = ?", runID, name).Get(&art)
+	if err != nil {
+		return nil, err
+	} else if !has {
+		return nil, util.ErrNotExist
+	}
+	return &art, nil
+}
+
+// GetArtifactByID returns an artifact by id
+func GetArtifactByID(ctx context.Context, id int64) (*ActionArtifact, error) {
+	var art ActionArtifact
+	has, err := db.GetEngine(ctx).ID(id).Get(&art)
+	if err != nil {
+		return nil, err
+	} else if !has {
+		return nil, util.ErrNotExist
+	}
+
+	return &art, nil
+}
+
+// UpdateArtifactByID updates an artifact by id
+func UpdateArtifactByID(ctx context.Context, id int64, art *ActionArtifact) error {
+	art.ID = id
+	_, err := db.GetEngine(ctx).ID(id).AllCols().Update(art)
+	return err
+}
+
+// ListArtifactsByRunID returns all artifacts of a run
+func ListArtifactsByRunID(ctx context.Context, runID int64) ([]*ActionArtifact, error) {
+	arts := make([]*ActionArtifact, 0, 10)
+	return arts, db.GetEngine(ctx).Where("run_id=?", runID).Find(&arts)
+}
+
+// ListUploadedArtifactsByRunID returns all uploaded artifacts of a run
+func ListUploadedArtifactsByRunID(ctx context.Context, runID int64) ([]*ActionArtifact, error) {
+	arts := make([]*ActionArtifact, 0, 10)
+	return arts, db.GetEngine(ctx).Where("run_id=? AND status=?", runID, ArtifactStatusUploadConfirmed).Find(&arts)
+}
+
+// ListArtifactsByRepoID returns all artifacts of a repo
+func ListArtifactsByRepoID(ctx context.Context, repoID int64) ([]*ActionArtifact, error) {
+	arts := make([]*ActionArtifact, 0, 10)
+	return arts, db.GetEngine(ctx).Where("repo_id=?", repoID).Find(&arts)
+}