Add test files for Woodpecker CI

Author: sirosen

tests/example-files/hooks/negative/woodpecker-ci/empty.yaml

@@ -0,0 +1 @@
+{}

tests/example-files/hooks/positive/woodpecker-ci/pipeline-clone.yaml

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+#
+# this file is copied from the woodpecker repo and therefore licensed under the
+# Woodpecker Apache 2.0 license:
+#
+#   Copyright 2018 Drone.IO Inc.
+#   Copyright 2020 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.
+#
+# see:
+# https://github.com/woodpecker-ci/woodpecker/blob/f529b609c3356c671270db9f0a78191ef8b93590/pipeline/frontend/yaml/linter/schema/.woodpecker/test-clone.yaml
+clone:
+  git:
+    image: plugins/git:next
+    depth: 50
+    path: bitbucket.org/foo/bar
+    recursive: true
+    submodule_override:
+      my-module: https://github.com/octocat/my-module.git
+
+steps:
+  test:
+    image: alpine
+    commands:
+      - echo "test"