* refactor(ci): use GitHub secrets and variables
We've been using values that are variable across multiple workflows,
and those can only be changed if modifying the workflows, but we should
be able to change the values without committing new changes in the code
for this purpose we're now using GitHub Variables, and even moving
non-sensitive information into variables instead of secrets. Allowing
more flexibility and other scenarios that should be easier to manage,
like deploying to Mainnet or Testnet.
* refactor(ci): use new GitHub variables for GCP auth
* fix(ci): typo
* fix(ci): do not use multiple variables for the same value
* fix(ci): typo in variable
* fix(vars): use different variables for machine types
* fix(vars): missing substitution
* fix: typo
* fix: make the input CI network override the default network
* Use the correct network variable for creating disks
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Co-authored-by: teor <teor@riseup.net>
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