Switch to reusable DCO (#728)

Signed-off-by: Dscano <d.scano89@gmail.com>

Author: Dscano

.github/workflows/dco-welcome.yml

@@ -6,52 +6,5 @@ on:
 
 jobs:
   dco-help:
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-      issues: write
-      pull-requests: write
-    if: |
-      github.event.check_run.conclusion == 'failure' &&
-      contains(github.event.check_run.name, 'DCO') &&
-      github.event.check_run.pull_requests[0] != null
-    steps:
-      - name: Load PR Context
-        id: pr-context
-        uses: actions/github-script@v7
-        with:
-          script: |
-            const prs = context.payload.check_run.pull_requests || [];
-            if (prs.length === 0) {
-              core.setOutput('should_comment', 'false');
-              return;
-            }
-
-            const prNumber = prs[0].number;
-            const { data: pr } = await github.rest.pulls.get({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              pull_number: prNumber,
-            });
-
-            const shouldComment = ['FIRST_TIME_CONTRIBUTOR', 'NONE'].includes(pr.author_association);
-            core.setOutput('pr_number', String(prNumber));
-            core.setOutput('should_comment', shouldComment ? 'true' : 'false');
-
-      - name: Post DCO Instructions
-        if: steps.pr-context.outputs.should_comment == 'true'
-        uses: peter-evans/create-or-update-comment@v3
-        with:
-          issue-number: ${{ steps.pr-context.outputs.pr_number }}
-          body: |
-            Welcome to the project, @${{ github.actor }}!
-
-            It looks like this is your first contribution. We noticed the **DCO (Developer Certificate of Origin)** check might fail if your commits aren't signed.
-
-            To fix this, please ensure every commit has a `Signed-off-by: Name <email>` line. You can do this automatically by using the `-s` flag:
-            `git commit -s -m "Your message"`
-
-            For existing commits, you can fix them with:
-            `git commit --amend --signoff` or `git rebase -i HEAD~N --signoff` (where N is the number of commits)
-            The Developer Community DCO guide also provides helpful tips on fixing DCO inconveniences. Setting a commit hook in the git repository will automate adding the DCO signoff.
-            See https://github.com/p4lang/governance/wiki/P4-DCO-Guidelines for information.
+    # https://github.com/p4lang/.github/blob/main/.github/workflows/dco-welcome-reusable.yml
+    uses: p4lang/.github/.github/workflows/dco-welcome-reusable.yml@main