infra: Make labeler workflow look only into master branch config

This way do not need to manually update this workflow when new branches
appear, or when the action version bumps,
as it autogenerates the labels from the supported_branches file.

.github/labeler.yml

@@ -8,8 +8,20 @@
 # File to automatically label pull requests
 # See https://github.com/actions/labeler
 
-# Always apply target fedora version to any changes
-f41:
+rawhide:
+- base-branch: master
+- any:
+  - changed-files:
+    - any-glob-to-any-file: ['**']
+
+rhel-9:
+- base-branch: rhel-9
+- any:
+  - changed-files:
+    - any-glob-to-any-file: ['**']
+
+rhel-10:
+- base-branch: rhel-10
 - any:
   - changed-files:
     - any-glob-to-any-file: ['**']

.github/labeler.yml.j2

@@ -1,17 +1,19 @@
 # File to automatically label pull requests
 # See https://github.com/actions/labeler
 
-# Always apply target fedora version to any changes
-{% if distro_name == "fedora" and distro_release == "rawhide" %}
-f{$ rawhide_fedora_version $}:
-{% elif distro_name == "fedora" %}
-f{$ distro_release $}:
-{% elif distro_name == "rhel" %}
-rhel-{$ distro_release $}:
-{% endif %}
+rawhide:
+- base-branch: master
 - any:
   - changed-files:
     - any-glob-to-any-file: ['**']
+{% for branch in supported_branches %}
+
+{$ branch|first $}:
+- base-branch: {$ branch|first $}
+- any:
+  - changed-files:
+    - any-glob-to-any-file: ['**']
+{% endfor %}
 
 documentation:
 - any: