update build script

Author: imoize

.github/workflows/build.yml

@@ -3,44 +3,43 @@ name: build
 on:
   workflow_dispatch:
   schedule:
-      - cron: "0 0 1 * *"
+    - cron: '0 0 1 * *'
   push:
-    branches: 
-      - "main"
-    tags: 
-      - "*"
+    branches:
+      - 'main'
+    tags:
+      - '*'
     paths-ignore:
-      - "**.md"
+      - '**.md'
   pull_request:
     branches:
-      - "main"
+      - 'main'
     paths-ignore:
-      - "**.md"
-    
+      - '**.md'
+
 env:
   DOCKERHUB_SLUG: imoize/alpine-s6
   GHCR_SLUG: ghcr.io/imoize/alpine-s6
-  ALPINE_LATEST: 3.19
+  ALPINE_LATEST: 3.21
 
 jobs:
   build:
     strategy:
       fail-fast: false
       matrix:
         alpine_version:
-          - 3.17
-          - 3.18
-          - 3.19
+          - 3.20
+          - 3.21
 
     runs-on: ubuntu-latest
     permissions:
       contents: read
       packages: write
-      
+
     steps:
       - name: Checkout Repository
         uses: actions/checkout@v4
-      
+
       - name: Preparation
         id: prep
         run: |
@@ -54,7 +53,7 @@ jobs:
           else
               LATEST="false"
           fi
-          
+
           echo "image_version=$IMAGE_VERSION" >> "$GITHUB_OUTPUT"
           echo "alpine_version=$ALPINE_VERSION" >> "$GITHUB_OUTPUT"
           echo "latest=$LATEST" >> "$GITHUB_OUTPUT"
@@ -102,15 +101,15 @@ jobs:
       - name: Build and Push Docker Image
         if: ${{ github.event_name != 'pull_request' }}
         id: build-and-push
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           platforms: linux/amd64,linux/arm64
           build-args: ALPINE_VERSION=${{ steps.prep.outputs.build_arg }}
           push: ${{ github.event_name != 'pull_request' }}
           labels: ${{ steps.meta.outputs.labels }}
           tags: ${{ steps.meta.outputs.tags }}
-      
+
       - name: Docker Hub Description
         if: github.event_name != 'pull_request'
         uses: peter-evans/dockerhub-description@v4
@@ -132,4 +131,4 @@ jobs:
           docker pull ${{ env.DOCKERHUB_SLUG }}:${{ steps.prep.outputs.alpine_version }}
           docker image inspect ${{ env.DOCKERHUB_SLUG }}:${{ steps.prep.outputs.alpine_version }}
           docker pull ${{ env.GHCR_SLUG }}:${{ steps.prep.outputs.alpine_version }}
-          docker image inspect ${{ env.GHCR_SLUG }}:${{ steps.prep.outputs.alpine_version }}
+          docker image inspect ${{ env.GHCR_SLUG }}:${{ steps.prep.outputs.alpine_version }}