FIrst draft hydra head (#1469) #4162

Job	Run time
Build & test (plutus-cbor)	1m 28s
Build haddock using nix	1m 23s
Build & test (plutus-merkle-tree)	1m 26s
Build & test (hydra-plutus)	1m 28s
Build & test (hydra-tui)	2m 16s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	2m 41s
Build & test (hydra-node)	4m 33s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	1m 53s
Build & test (hydra-cluster)	7m 41s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	4m 58s
Benchmarks (plutus-merkle-tree, on-chain-cost, $(pwd)/../benchmarks)	1m 36s
Build specification using nix	55s
nix flake check	4m 57s
Publish benchmark results	0s
Publish test results	10s
Documentation	1m 15s
	38m 40s

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