ci: tag container main & main-date

Make sure we always have a { branch name } container tag in addition to
a { branch name + date } tag. This way we have a rolling { branch name }
of the main and release branches

.github/workflows/dev_container.yml

@@ -43,7 +43,8 @@ jobs:
             type=semver,pattern={{version}}
             type=semver,pattern={{major}}.{{minor}}
             type=semver,pattern={{major}}
-            type=ref,event=branch,suffix=-{{date 'YYYYMMDD'}}
+            type=ref,event=branch,suffix=-{{date 'YYYYMMDD'}},priority=600
+            type=ref,event=branch,suffix=,priority=500
             type=ref,event=pr
             type=sha