Add RPM package publishing (#56797)

Just tested deb publishing, and confirmed it works. Noticed that RPM packages aren't published though
It's the exact same step, targetting the RPM files instead
Both steps will run in parallel

Co-authored-by: dsotirakis <dimitrios.sotirakis@grafana.com>

scripts/drone/events/release.star

@@ -390,7 +390,8 @@ def publish_packages_pipeline():
         compile_build_cmd(),
         publish_packages_step(edition='oss', ver_mode='release'),
         publish_grafanacom_step(edition='oss', ver_mode='release'),
-        publish_linux_packages_step(edition='oss'),
+        publish_linux_packages_step(edition='oss', package_manager='deb'),
+        publish_linux_packages_step(edition='oss', package_manager='rpm'),
     ]
 
     enterprise_steps = [
@@ -398,7 +399,8 @@ def publish_packages_pipeline():
         compile_build_cmd(),
         publish_packages_step(edition='enterprise', ver_mode='release'),
         publish_grafanacom_step(edition='enterprise', ver_mode='release'),
-        publish_linux_packages_step(edition='enterprise'),
+        publish_linux_packages_step(edition='enterprise', package_manager='deb'),
+        publish_linux_packages_step(edition='enterprise', package_manager='rpm'),
     ]
     deps = [
         'publish-artifacts-public',

scripts/drone/steps/lib.star

@@ -1044,9 +1044,9 @@ def publish_grafanacom_step(edition, ver_mode):
         ],
     }
 
-def publish_linux_packages_step(edition):
+def publish_linux_packages_step(edition, package_manager='deb'):
     return {
-        'name': 'publish-linux-packages',
+        'name': 'publish-linux-packages-{}'.format(package_manager),
         # See https://github.com/grafana/deployment_tools/blob/master/docker/package-publish/README.md for docs on that image
         'image': 'us.gcr.io/kubernetes-dev/package-publish:latest',
         'depends_on': [
@@ -1063,7 +1063,7 @@ def publish_linux_packages_step(edition):
             'gpg_passphrase': from_secret('packages_gpg_passphrase'),
             'gpg_public_key': from_secret('packages_gpg_public_key'),
             'gpg_private_key': from_secret('packages_gpg_private_key'),
-            'package_path': 'gs://grafana-prerelease/artifacts/downloads/*${{DRONE_TAG}}/{}/**.deb'.format(edition)
+            'package_path': 'gs://grafana-prerelease/artifacts/downloads/*${{DRONE_TAG}}/{}/**.{}'.format(edition, package_manager)
         }
     }