Remove attestation step for private repository

Attestations are not available for private user-owned repos.
Removed the step to prevent workflow failures.
Image publishing works fine without attestations.

Author: JSv4

.github/workflows/docker-publish.yml

@@ -27,8 +27,6 @@ jobs:
     permissions:
       contents: read
       packages: write
-      id-token: write
-      attestations: write
 
     steps:
       - name: Checkout repository
@@ -85,12 +83,3 @@ jobs:
           cache-from: type=gha
           cache-to: type=gha,mode=max
           platforms: linux/amd64
-
-      - name: Generate artifact attestation
-        if: github.event_name != 'pull_request'
-        uses: actions/attest-build-provenance@v1
-        continue-on-error: true
-        with:
-          subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
-          subject-digest: ${{ steps.build-and-push.outputs.digest }}
-          push-to-registry: true