Merge 59f7afbe0c into 8d8c7c12f7

I was using `release/*` mistakenly but this cannot work.

Signed-off-by: Matthieu Vachon <matthieu.o.vachon@gmail.com>

README.md

@@ -645,6 +645,8 @@ tags: |
   type=edge,enable=true,priority=700,prefix=,suffix=,branch=$repo.default_branch
 ```
 
+The `branch` attribute is matched using strict equality, e.g. it doesn't support regular expression nor glob pattern when matching.
+
 ### `type=ref`
 
 ```yaml