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Old pr https://github.com/go-gitea/gitea/pull/22345 is outdated after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.

2 files changed, 16 insertions, 4 deletions

diff --git a/modules/setting/actions.go b/modules/setting/actions.go
index b11500dab4..eb1b637a1c 100644
--- a/modules/setting/actions.go
+++ b/modules/setting/actions.go
@@ -10,7 +10,8 @@ import (
 // Actions settings
 var (
 	Actions = struct {
-		Storage           // how the created logs should be stored
+		LogStorage        Storage // how the created logs should be stored
+		ArtifactStorage   Storage // how the created artifacts should be stored
 		Enabled           bool
 		DefaultActionsURL string `ini:"DEFAULT_ACTIONS_URL"`
 	}{
@@ -25,5 +26,9 @@ func loadActionsFrom(rootCfg ConfigProvider) {
 		log.Fatal("Failed to map Actions settings: %v", err)
 	}
 
-	Actions.Storage = getStorage(rootCfg, "actions_log", "", nil)
+	actionsSec := rootCfg.Section("actions.artifacts")
+	storageType := actionsSec.Key("STORAGE_TYPE").MustString("")
+
+	Actions.LogStorage = getStorage(rootCfg, "actions_log", "", nil)
+	Actions.ArtifactStorage = getStorage(rootCfg, "actions_artifacts", storageType, actionsSec)
 }
diff --git a/modules/storage/storage.go b/modules/storage/storage.go
index caecab306e..5b6efccb6a 100644
--- a/modules/storage/storage.go
+++ b/modules/storage/storage.go
@@ -128,6 +128,8 @@ var (
 
 	// Actions represents actions storage
 	Actions ObjectStorage = uninitializedStorage
+	// Actions Artifacts represents actions artifacts storage
+	ActionsArtifacts ObjectStorage = uninitializedStorage
 )
 
 // Init init the stoarge
@@ -212,9 +214,14 @@ func initPackages() (err error) {
 func initActions() (err error) {
 	if !setting.Actions.Enabled {
 		Actions = discardStorage("Actions isn't enabled")
+		ActionsArtifacts = discardStorage("ActionsArtifacts isn't enabled")
 		return nil
 	}
-	log.Info("Initialising Actions storage with type: %s", setting.Actions.Storage.Type)
-	Actions, err = NewStorage(setting.Actions.Storage.Type, &setting.Actions.Storage)
+	log.Info("Initialising Actions storage with type: %s", setting.Actions.LogStorage.Type)
+	if Actions, err = NewStorage(setting.Actions.LogStorage.Type, &setting.Actions.LogStorage); err != nil {
+		return err
+	}
+	log.Info("Initialising ActionsArtifacts storage with type: %s", setting.Actions.ArtifactStorage.Type)
+	ActionsArtifacts, err = NewStorage(setting.Actions.ArtifactStorage.Type, &setting.Actions.ArtifactStorage)
 	return err
 }