Add OpenSUSE zypper command for rpm repo (#4076)

doc/rpm-repo.md

@@ -11,6 +11,13 @@ sudo dnf config-manager --add-repo https://ksp-ckan.s3-us-west-2.amazonaws.com/r
 sudo dnf install ckan
 ```
 
+### Or if you are on OpenSUSE
+
+```
+sudo zypper addrepo https://ksp-ckan.s3-us-west-2.amazonaws.com/rpm/stable/ckan_stable.repo
+sudo zypper install ckan
+```
+
 ## Nightly builds
 
 If you like to live dangerously, these are the bleeding edge builds that are generated every time we merge changes to the main branch. On the plus side, you'll get fixes and enhancements faster than everyone else. On the minus side, these builds are essentially untested; we don't know whether they're reliable until we take a close look at them and make sure they're complete and won't break things, at which point they turn into a stable build (if that sounds more like what you want, scroll up to the previous section).
@@ -21,3 +28,10 @@ Things may break! But if they do and you [report it to us](https://github.com/KS
 sudo dnf config-manager --add-repo https://ksp-ckan.s3-us-west-2.amazonaws.com/rpm/nightly/ckan_nightly.repo
 sudo dnf install ckan
 ```
+
+### Or if you are on OpenSUSE
+
+```
+sudo zypper addrepo https://ksp-ckan.s3-us-west-2.amazonaws.com/rpm/nightly/ckan_nightly.repo
+sudo zypper install ckan
+```