Fix permissions of publish docs workflow #4243

Job	Run time
Build specification using nix	1m 4s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	2m 50s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	2m 7s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	5m 13s
Build & test (plutus-cbor)	1m 31s
Benchmarks (plutus-merkle-tree, on-chain-cost, $(pwd)/../benchmarks)	1m 43s
Build & test (plutus-merkle-tree)	1m 37s
Build haddock using nix	1m 24s
Build & test (hydra-plutus)	1m 35s
Build & test (hydra-tui)	2m 25s
nix flake check	4m 29s
Build & test (hydra-node)	4m 51s
Build & test (hydra-cluster)	7m 51s
Publish benchmark results	0s
Documentation	1m 30s
Publish test results	13s
	40m 23s

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