TSA secret always required for TUF deployment

[xoanmi]

Description

Currently, the TSA secret is consistently mandated for TUF deployment, despite its optional nature. Could consideration be given to implementing a flag that allows for the exclusion of this secret setup if deemed unnecessary?"

[vipulagarwal]

There is some activity on #744 but if anyone is blocked by this can try the following:

  tsa:
    create: true
    name: tsa-cert-chain
    key: cert-chain
    path: dummyfile
    value: "dummyvalue"

This will make the dummyfile available in your tuf root though.

[vipulagarwal]

@bobcallaway can we close this issue? It has been fixed in #744