Fix validUntil value for free c2d.

[mariacarmina]

Fixes #900 .

Changes proposed in this PR:

• fix workflow for system tests to avoid infinite loop
• update logic for validUntil:
  If validUntil exceeds env.maxJobDuration -> validUntil == env.maxJobDuration
• if validUntil is not provided (because it was set with null on free start compute task) -> fallback to env.maxJobDuration if exists, if env.maxJobDuration does not exist -> validUntil remains null.

[mariacarmina]

Before validUntil modification:

where validUntil was identical with dateCreated

After validUntil modification:

Now the alogorithm printed the whole steps, meaning that the validUntil was sufficient.

[giurgiur99]

LGTM 🚀

[alexcos20]

Hold this for a moment, please

[alexcos20]

Please checkout

ocean-node/src/components/core/compute/startCompute.ts

Lines 512 to 530 in 56baf45

	let maxDuration = null
	if (env.free.maxJobDuration) {
	maxDuration = env.free.maxJobDuration
	}
	const response = await engine.startComputeJob(
	task.datasets,
	task.algorithm,
	task.output,
	task.environment,
	task.consumerAddress,
	maxDuration,
	task.resources,
	{
	chainId: null,
	token: null,
	lockTx: null,
	claimTx: null
	}
	)