ci: add main/master branch trigger to docker-build workflow

.gitea/workflows/docker-build.yaml

@@ -2,14 +2,12 @@ name: Docker Build
 
 on:
   push:
+    branches:
+      - main
+      - master
     tags:
       - 'v*'
   workflow_dispatch:
-    inputs:
-      tag:
-        description: 'Tag name to build (e.g., v0.10.8)'
-        required: true
-        type: string
 
 jobs:
   build-and-push:
@@ -44,8 +42,11 @@ jobs:
         run: |
           if [ -n "${{ github.event.inputs.tag }}" ]; then
             TAG="${{ github.event.inputs.tag }}"
-          else
+          elif echo "${{ github.ref }}" | grep -q "^refs/tags/"; then
             TAG=${GITHUB_REF#refs/tags/}
+          else
+            SHORT_SHA=$(git rev-parse --short HEAD)
+            TAG="dev-${SHORT_SHA}"
           fi
           echo "TAG=${TAG}" >> $GITHUB_ENV
           echo "${TAG}" > VERSION