Optimize: Remove Buildx to fix 5-minute hang and use native docker build

.github/workflows/docker-build.yml

@@ -40,9 +40,6 @@ jobs:
           fi
           docker --version
 
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-
       - name: Log in to GitHub Container Registry
         uses: docker/login-action@v3
         with:
@@ -51,10 +48,8 @@ jobs:
           password: ${{ secrets.GHCR_TOKEN }}
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v5
-        with:
-          context: .
-          push: true
-          tags: |
-            ghcr.io/kroonk/mischlabs:latest
-            ghcr.io/kroonk/mischlabs:${{ github.sha }}
+        shell: sh
+        run: |
+          docker build -t ghcr.io/kroonk/mischlabs:latest -t ghcr.io/kroonk/mischlabs:${{ github.sha }} .
+          docker push ghcr.io/kroonk/mischlabs:latest
+          docker push ghcr.io/kroonk/mischlabs:${{ github.sha }}