fix(ci): disable GitHub Actions cache and attestation for Gitea

The GHA cache and attestation features don't exist in Gitea and were
causing the workflow to timeout/fail even though the build succeeded.
Disabled these GitHub-specific features.

.github/workflows/release-server.yaml

@@ -165,17 +165,19 @@ jobs:
             BUILD_NUMBER=${{ needs.meta.outputs.build_number }}
             BUILD_TIMESTAMP=${{ needs.meta.outputs.timestamp }}
             RELEASE_CHANNEL=${{ needs.meta.outputs.channel }}
-          cache-from: type=gha,scope=server-${{ needs.meta.outputs.channel }}
-          cache-to: type=gha,mode=max,scope=server-${{ needs.meta.outputs.channel }}
-          provenance: true
-          sbom: true
+          # GitHub Actions cache not available in Gitea - disabled
+          # cache-from: type=gha,scope=server-${{ needs.meta.outputs.channel }}
+          # cache-to: type=gha,mode=max,scope=server-${{ needs.meta.outputs.channel }}
+          provenance: false
+          sbom: false
 
-      - name: attest
-        uses: actions/attest-build-provenance@v2
-        with:
-          subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME_SERVER }}
-          subject-digest: ${{ steps.build.outputs.digest }}
-          push-to-registry: true
+      # GitHub-specific attestation - not available in Gitea
+      # - name: attest
+      #   uses: actions/attest-build-provenance@v2
+      #   with:
+      #     subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME_SERVER }}
+      #     subject-digest: ${{ steps.build.outputs.digest }}
+      #     push-to-registry: true
 
   create-release:
     name: create release