feat: add branch to context, set version to include branch

custom-recipes/recipes/damnit/recipe.yaml

@@ -1,13 +1,15 @@
 context:
   name: damnit
   version: '0.1'
+  branch: 'master'
 
 package:
   name: '{{ name|lower }}'
-  version: '{{ version }}'
+  version: '{{ version }}+{{ branch }}'
 
 source:
   git_url: https://github.com/European-XFEL/damnit
+  git_branch: '{{ branch }}'
   patches:
     - qscintilla-version.patch