Always rebuild docker image in CI

.github/workflows/main.yml

@@ -52,20 +52,7 @@ jobs:
           username: ${{ secrets.REGISTRY_USERNAME || github.actor }}
           password: ${{ secrets.REGISTRY_PASSWORD || secrets.GITHUB_TOKEN }}
 
-      - name: Check for existing image
-        id: image-check
-        env:
-          TARGET_TAG: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.wylab.outputs.commit }}
-        run: |
-          if docker manifest inspect "$TARGET_TAG" >/dev/null 2>&1; then
-            echo "exists=true" >> "$GITHUB_OUTPUT"
-            echo "Image $TARGET_TAG already exists; skipping build."
-          else
-            echo "exists=false" >> "$GITHUB_OUTPUT"
-          fi
-
       - name: Build and push Docker image
-        if: ${{ steps.image-check.outputs.exists != 'true' }}
         uses: docker/build-push-action@f2a1d5e99d037542a71f64918e516c093c6f3fc4
         with:
           context: .