GitHub: Nuke broken sigstore cosign container image signing

.github/workflows/build.yaml

@@ -30,12 +30,6 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
-      - name: Install cosign
-        if: ${{ github.event_name != 'pull_request' }}
-        uses: sigstore/[email protected]
-        with:
-          cosign-release: "v2.2.4"
-
       # Set up BuildKit Docker container builder to be able to build multi-platform images and export cache
       - name: Set up Docker Buildx
         uses: docker/[email protected]
@@ -63,14 +57,3 @@ jobs:
       - name: Push container image
         if: ${{ github.event_name != 'pull_request' }}
         run: docker push ghcr.io/vorburger/dotfiles-fedora
-
-      # Sign the resulting Docker image digest (see https://github.com/sigstore/cosign)
-      - name: Sign the published Docker image
-        if: ${{ github.event_name != 'pull_request' }}
-        env:
-          # https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-an-intermediate-environment-variable
-          TAGS: ${{ steps.meta.outputs.tags }}
-          DIGEST: ${{ steps.build-and-push.outputs.digest }}
-        # This step uses the identity token to provision an ephemeral certificate
-        # against the sigstore community Fulcio instance.
-        run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}