build for alpha tags as well

Author: lihebi

.github/workflows/docker-build.yml

@@ -4,6 +4,7 @@ on:
   push:
     tags:
       - "v*.*.*"
+      - "v*.*.*-alpha.*"
 
 jobs:
   docker:
@@ -62,4 +63,4 @@ jobs:
           context: ${{ matrix.context }}
           push: true
           tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
+          labels: ${{ steps.meta.outputs.labels }}