DCO Check GitHub workflow (#7179)

DCO App not working and needed to be disabled the check.
Introducing DCO GitHub action workflow to validate the commit signatures.

Closes #7175

Signed-off-by: Chaminda Divitotawela <cdivitotawela@gmail.com>
Signed-off-by: Ry Jones <ry@linux.com>

.github/workflows/dco.yml

@@ -0,0 +1,19 @@
+name: DCO
+
+on: [pull_request]
+
+jobs:
+  dco_check:
+    runs-on: ubuntu-latest
+    name: DCO
+    if: ${{ github.actor != 'dependabot[bot]' }}
+    steps:
+    - name: Get PR Commits
+      id: 'get-pr-commits'
+      uses: tim-actions/get-pr-commits@198af03565609bb4ed924d1260247b4881f09e7d
+      with:
+        token: ${{ secrets.GITHUB_TOKEN }}
+    - name: DCO Check
+      uses: tim-actions/dco@f2279e6e62d5a7d9115b0cb8e837b777b1b02e21
+      with:
+        commits: ${{ steps.get-pr-commits.outputs.commits }}