ci: correctly download and merge manifests

Author: id

.github/workflows/main.yaml

@@ -205,7 +205,7 @@ jobs:
     - name: Upload digest
       uses: actions/upload-artifact@65462800fd760344b1a7b4382951275a0abb4808 # v4.3.3
       with:
-        name: "digests-${{ matrix.platform[0] }}-${{ matrix.otp }}-${{ matrix.elixir }}"
+        name: "digests-${{ matrix.platform[0] }}-${{ matrix.otp }}-${{ matrix.elixir }}-${{ matrix.platform[1] == 'linux/amd64' && 'amd64' || 'arm64' }}"
         path: /tmp/digests/*
         if-no-files-found: error
         retention-days: 1
@@ -248,8 +248,9 @@ jobs:
       - name: Download digests
         uses: actions/download-artifact@65a9edc5881444af0b9093a5e628f2fe47ea3b2e # v4.1.7
         with:
-          name: "digests-${{ matrix.platform }}-${{ matrix.otp }}-${{ matrix.elixir }}"
+          pattern: "digests-${{ matrix.platform }}-${{ matrix.otp }}-${{ matrix.elixir }}-*"
           path: /tmp/digests
+          merge-multiple: true
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@d70bba72b1f3fd22344832f00baa16ece964efeb # v3.3.0
       - name: Docker meta