Add 'required' attribute to release job

[ghost]

Thanks to @jbgi this PR fixes the notification we get in GH actions from Hydra-the-CI. What happened is the following:

1. Hydra notifications reportedly errored on the Hydra side and Devops did not know why
2. devops group was recently added as and admin for ALL IOHK repositories as a "Base level escalation access to IOG repos"
3. This caused the notification to on the Hydra-the-CI side to succeed but it then reported a failure because there were no required builds in the release.nix configuration

Hydra-the-CI was configured for Hydra-the-layer-2 here: https://github.com/input-output-hk/ci-ops/blob/master/modules/hydra-master-main.nix#L47-L81

This PR fixes this configuration.

[github-actions]

Unit Test Results

257 tests  ±0   251 ✔️ ±0   14m 15s ⏱️ - 1m 22s
  91 suites ±0       6 💤 ±0 
    5 files   ±0       0 ❌ ±0 

Results for commit ba89d7d. ± Comparison against base commit ccb8242.

♻️ This comment has been updated with latest results.

[github-actions]

Transactions Costs

Sizes and execution budgets for Hydra protocol transactions. Note that unlisted parameters are currently using arbitrary values and results are not fully deterministic and comparable to previous runs.

Metadata
Generated at	2022-10-05 11:14:06.281828675 UTC
Max. memory units	14000000
Max. CPU units	10000000000
Max. tx size (kB)	16384

Cost of Init Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	4833	10.63	4.22	0.48
2	5037	14.01	5.55	0.53
3	5241	15.76	6.23	0.55
5	5652	18.23	7.13	0.60
10	6678	29.90	11.68	0.77
45	13854	98.88	38.25	1.83

Cost of Commit Transaction

Currently only one UTxO per commit allowed (this is about to change soon)

UTxO	Tx size	% max Mem	% max CPU	Min fee ₳
1	5771	19.83	8.01	0.62

Cost of CollectCom Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	13058	20.60	8.25	0.95
2	13450	37.33	15.12	1.15
3	13774	56.23	22.95	1.38
4	14022	76.75	31.47	1.61

Cost of Close Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	9331	8.19	3.36	0.65
2	9492	8.97	3.81	0.67
3	9657	9.75	4.27	0.68
5	9690	9.83	3.83	0.68
10	10881	15.99	7.73	0.81
30	14225	33.00	17.31	1.17
64	15606	38.36	14.53	1.25

Cost of Contest Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	9330	8.16	3.34	0.65
2	9493	8.94	3.79	0.67
3	9660	9.72	4.24	0.68
5	9990	11.28	5.15	0.72
10	10813	15.18	7.40	0.80
30	14221	32.42	17.07	1.16
43	16363	42.74	23.01	1.38

Cost of Abort Transaction

Some variation because of random mixture of still initial and already committed outputs.

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	13563	23.36	9.68	1.01
2	13604	34.02	14.28	1.13
3	14139	58.64	25.61	1.43
4	14462	83.31	37.23	1.73
5	14360	95.44	41.55	1.85

Cost of FanOut Transaction

Involves spending head output and burning head tokens. Uses ada-only UTxO for better comparability.

UTxO	Tx size	% max Mem	% max CPU	Min fee ₳
1	13420	9.88	4.31	0.85
2	13584	12.46	5.61	0.89
3	13622	13.98	6.49	0.91
5	13563	15.96	7.83	0.93
10	13745	23.57	12.23	1.03
50	15177	84.50	47.45	1.84
60	15538	99.74	56.26	2.05