fix

.github/workflows/release.yml

@@ -31,9 +31,6 @@ env:
 jobs:
   docker:
     runs-on: ubuntu-latest
-    env:
-      # Needed to remove the "unsupported MIME type for compression: application/vnd.in-toto+json"
-      BUILDX_NO_DEFAULT_ATTESTATIONS: 1
     steps:
       -
         name: Checkout
@@ -137,6 +134,13 @@ jobs:
             org.opencontainers.image.created=${{ steps.prep.outputs.created }}
             org.opencontainers.image.revision=${{ github.sha }}
             org.opencontainers.image.licenses=${{ github.event.repository.license.spdx_id }}
+      -
+        name: Install latest Skopeo # GitHub's ubuntu 22 uses Skopeo 1.4 but we need newer to fix the "unsupported MIME type for compression: application/vnd.in-toto+json" error
+        run: |
+          echo 'deb http://download.opensuse.org/repositories/home:/alvistack/xUbuntu_22.04/ /' | sudo tee /etc/apt/sources.list.d/home:alvistack.list
+          curl -fsSL https://download.opensuse.org/repositories/home:alvistack/xUbuntu_22.04/Release.key | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/home_alvistack.gpg > /dev/null
+          sudo apt update
+          sudo apt -o Dpkg::Options::="--force-overwrite" install skopeo
       -
         name: Copy to Docker Hub
         id: copy_images