Hash verification steps added

[offa]

Adds steps for file hash verification, which fail the build if the expected hash doesn't match the actual one.

Example

sha256Verify(file: 'f.txt', hash: 'ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad')

To Do

• Step naming ok?
• Best suited exception type thrown on hash mismatch (Exception at the moment)?

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[rsandell]

It looks good. I leave it to you to decide if you want to use the AbortException instead, which I believe is a better choice.
Regarding the name, I'm ok as it is, maybe naming it the other way around would sound better, e.g. verifySha256. WDYT?

[offa]

Regarding the name, I'm ok as it is, maybe naming it the other way around would sound better, e.g. verifySha256. WDYT?

I'm fine with both. But since verifySha… sounds more natural, it's a better choice I guess. 👍

[offa]

PR updated and merged with master.