If a new manylinux image isn't needed to be built, use the latest from main

.github/workflows/wheels.yml

@@ -24,6 +24,7 @@ permissions:
 env:
   REGISTRY: ghcr.io
   IMAGE_NAME: ${{ github.repository }}-manylinux2014
+  FALLBACK_TAG: ghcr.io/${{ github.repository }}-manylinux2014:main
 
 jobs:
   build-custom-manylinux:
@@ -31,6 +32,9 @@ jobs:
     permissions:
       contents: read
       packages: write
+    outputs:
+      tag: ${{ steps.meta.outputs.labels || env.FALLBACK_TAG }}
+
     steps:
       - name: Checkout repository
         uses: actions/checkout@v3
@@ -122,12 +126,6 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Extract metadata (tags, labels) for Docker
-        id: meta
-        uses: docker/metadata-action@818d4b7b91585d195f67373fd9cb0332e31a7175 #v4.6.0
-        with:
-          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
-
       - name: Build wheels
         uses: pypa/cibuildwheel@66b46d086804a9e9782354100d96a3a445431bca # v2.14.0
         env:
@@ -137,7 +135,7 @@ jobs:
           CIBW_CONTAINER_ENGINE: "docker; create_args: '--volume=${{ github.workspace  }}/.ccache:/.ccache'"
           # overriede before-all in pyproject.toml
           CIBW_BEFORE_ALL: ""
-          CIBW_MANYLINUX_X86_64_IMAGE: ${{ steps.meta.outputs.tags }}
+          CIBW_MANYLINUX_X86_64_IMAGE: ${{ needs.build-custom-manylinux.outputs.tag }}
 
       - uses: actions/upload-artifact@0b7f8abb1508181956e8e162db84b466c27e18ce # v3.1.2
         with: