ci: Run on all branches

Since we are now encouraging using forks, there is no need to limit the
branches we run on, which needs extra maintenance.

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

.github/workflows/ci.yaml

@@ -1,10 +1,6 @@
 name: frequenz-sdk-python
 
-on:
-  push:
-    branches: [ v0.x.x ]
-
-  pull_request:
+on: [pull_request, push, workflow_dispatch]
 
 env:
   REGISTRY: ghcr.io