Add a sign-off check in the workflow

.github/PULL_REQUEST_TEMPLATE.md

@@ -4,5 +4,4 @@ Please place an 'X' inside each '[]' to confirm you adhere to our [Contributor G
 - [ ] Is the commit message split over multiple lines and hard-wrapped at 72 characters?
 - [ ] Is the subject and message clear and concise?
 - [ ] Does the subject start with **[plugin_name]** if submitting a plugin patch or a **[section_name]** if part of the core sosreport code?
-- [ ] Does the commit contain a **Signed-off-by: First Lastname <[email protected]>**?
-- [ ] Are any related Issues or existing PRs [properly referenced](https://docs.github.com/en/issues/tracking-your-work-with-issues/creating-issues/linking-a-pull-request-to-an-issue#linking-a-pull-request-to-an-issue-using-a-keyword) via a Closes (Issue) or Resolved (PR) line?
+- [ ] Are any related Issues or existing PRs [properly referenced](https://docs.github.com/en/issues/tracking-your-work-with-issues/creating-issues/linking-a-pull-request-to-an-issue#linking-a-pull-request-to-an-issue-using-a-keyword) via a Closes (Issue) or Resolved (PR) line?

.github/workflows/check-signed-off.yml

@@ -0,0 +1,18 @@
+name: Check signed-off in commits
+on:
+  pull_request:
+    types:
+      - synchronize
+      - opened
+      - reopened
+
+jobs:
+  check-signed-commits:
+    name: Check signed commits in PR
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+    steps:
+      - name: Check signed commits in PR
+        uses: 1Password/check-signed-commits-action@v1