Update GitHub PR template and/or CONTRIBUTING.md

This adds or updates the Github PR template or CONTRIBUTING.md files for this
repository to reflect the current versions in the master repository:

    https://github.com/jboss-container-images/github-pr-template

This Pull Request was auto generated by the scripts from the above repository.

Author: jmtd

.github/PULL_REQUEST_TEMPLATE.md

@@ -7,4 +7,5 @@ Please make sure your PR meets following requirements:
 - [ ] Pull Request contains description of the issue
 - [ ] Pull request does not include fixes for other issues than the main ticket
 - [ ] Attached commits represent unit of work and are properly formatted
+- [ ] You have read and agreed to the Developer Certificate of Origin (DCO) (see `CONTRIBUTING.md`)
 - [ ] Every commit contains `Signed-off-by: Your Name <[email protected]>` - use `git commit -s`

CONTRIBUTING.md

@@ -0,0 +1,51 @@
+This project requires the Developer Certificate of Origin (DCO) process to be
+followed. The DCO is an attestation attached to every contribution made by every
+developer, signifying that the developer licenses their contribution under the
+open source license governing the file(s) being modified. In the commit message
+of the contribution, simply add a Signed-off-by statement, which signifies
+agreement to the text at http://developercertificate.org, reproduced below: 
+
+Developer Certificate of Origin
+Version 1.1
+
+Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
+1 Letterman Drive
+Suite D4700
+San Francisco, CA, 94129
+
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but changing it is not allowed.
+
+Developer's Certificate of Origin 1.1
+
+By making a contribution to this project, I certify that:
+
+(a) The contribution was created in whole or in part by me and I
+    have the right to submit it under the open source license
+    indicated in the file; or
+
+(b) The contribution is based upon previous work that, to the best
+    of my knowledge, is covered under an appropriate open source
+    license and I have the right under that license to submit that
+    work with modifications, whether created in whole or in part
+    by me, under the same open source license (unless I am
+    permitted to submit under a different license), as indicated
+    in the file; or
+
+(c) The contribution was provided directly to me by some other
+    person who certified (a), (b) or (c) and I have not modified
+    it.
+
+(d) I understand and agree that this project and the contribution
+    are public and that a record of the contribution (including all
+    personal information I submit with it, including my sign-off) is
+    maintained indefinitely and may be redistributed consistent with
+    this project or the open source license(s) involved.
+
+The DCO requires a signoff message in the following format to appear on each
+commit:
+
+Signed-off-by: Your Name <[email protected]>
+
+If you set your user.name and user.email git configs, you can sign your commit
+automatically with git commit -s.