Resolve built-in variables for global when filter (#1790)

addresses
bd461477bd

close  #1244, close #1580

---------

Co-authored-by: Anbraten <anton@ju60.de>

pipeline/frontend/metadata/const.go

@@ -0,0 +1,32 @@
+// Copyright 2022 Woodpecker Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package metadata
+
+// Event types corresponding to scm hooks.
+const (
+	EventPush   = "push"
+	EventPull   = "pull_request"
+	EventTag    = "tag"
+	EventDeploy = "deployment"
+	EventCron   = "cron"
+	EventManual = "manual"
+)
+
+// Different ways to handle failure states
+const (
+	FailureIgnore = "ignore"
+	FailureFail   = "fail"
+	// FailureCancel = "cancel" // Not implemented yet
+)