fix github workflows with datetime

.github/workflows/build.yml

@@ -28,6 +28,10 @@ jobs:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
 
+      - name: Set datetime variable
+        id: vars
+        run: echo "DATETIME=$(date +'%Y%m%d%H%M')" >> $GITHUB_ENV
+
       - name: Build and push
         uses: docker/build-push-action@v4
         with:
@@ -35,7 +39,7 @@ jobs:
           push: true
           tags: |
             dalbodeule/chzzkbot:latest
-            dalbodeule/chzzkbot:$(git rev-parse --short HEAD)
+            dalbodeule/chzzkbot:${{ env.DATETIME }}
           platforms: |
             linux/amd64
             linux/arm64