Enhance first-time contributor welcome message (#6439)

* Enhance first-time contributor welcome message

Updated the welcome message for first-time contributors to include additional information and resources.

Signed-off-by: Ayush More <[email protected]>

* Enhance first-time contributor workflow message

Updated the first-time contributor message to improve clarity and added helpful resources.

Signed-off-by: Ayush More <[email protected]>

* Update first-time-contributor.yaml

Signed-off-by: Ayush More <[email protected]>

* Update first-time-contributor.yaml

Signed-off-by: Ayush More <[email protected]>

* Update .github/workflows/first-time-contributor.yaml

Signed-off-by: Eeshaan Sawant <[email protected]>

---------

Signed-off-by: Ayush More <[email protected]>
Signed-off-by: Eeshaan Sawant <[email protected]>
Co-authored-by: Eeshaan Sawant <[email protected]>

Author: Ayushmore1214

.github/workflows/first-time-contributor.yaml

@@ -36,17 +36,53 @@ jobs:
               return;
             }
 
-            const body = `
-👋 Hi @${prAuthor}, thanks for opening your first pull request to **PipeCD**!
+            const body = `👋 Hi @${prAuthor}, welcome to **PipeCD** and thanks for opening your first pull request!
 
-Here are a few helpful resources to get started:
--  Contributing guide: \`CONTRIBUTING.md\`
--  Common commands:
-  - \`make test\`
-  - \`make lint\`
+We’re really happy to have you here 🚀  
+Before your PR gets merged, please check a few important things below.
 
-If you have any questions, feel free to ask in this PR.
-Thanks for contributing!
+---
+
+### Helpful resources
+- Contributing guide: https://github.com/pipe-cd/pipecd/blob/master/CONTRIBUTING.md
+- Development setup: https://github.com/pipe-cd/pipecd/blob/master/CONTRIBUTING.md#development
+
+---
+
+### DCO Sign-off
+All commits must include a \`Signed-off-by\` line to comply with the Developer Certificate of Origin (DCO).
+
+In case you forget to sign-off your commit(s), follow these steps:
+
+For the last commit:
+\`\`\`bash
+git commit --amend --signoff
+git push --force-with-lease
+\`\`\`
+
+For multiple commits:
+\`\`\`bash
+git rebase --signoff origin/master
+git push --force-with-lease
+\`\`\`
+
+---
+
+### Run checks locally
+Before pushing updates, please run:
+\`\`\`bash
+make check
+\`\`\`
+This runs the same checks as CI and helps catch issues early.
+
+---
+
+### 💬 Need help?
+If anything is unclear, feel free to ask in this PR or join us on the CNCF Slack in the **#pipecd** channel.
+You can get your Slack invite from: https://communityinviter.com/apps/cloud-native/cncf
+
+
+Thanks for contributing to PipeCD! ❤️
 `;
 
             await github.rest.issues.createComment({