ci: create workflow to validate commits signatures for DCO (ZupIT#598)

Signed-off-by: Matheus Alcantara <[email protected]>

.github/workflows/dco.yaml

@@ -0,0 +1,25 @@
+# Copyright 2021 ZUP IT SERVICOS EM TECNOLOGIA E INOVACAO SA
+#
+# 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.
+
+name: DCO Validator
+on: [ "push" ]
+
+jobs:
+  dco-gpg-validator:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: ZupIT/[email protected]
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          VALIDATE_GPG: false