_ci_ : Change default shell options for snapcraft publish

[ianconsolata]

The builds were erroring only in CircleCI, when run manually the same
command worked fine. I reached out to CircleCI support, and got the
following message:

The reason you are seeing this error when running in CircleCI and not while debugging with SSH is due to the -e set in #!/bin/bash -eo pipefail at the beginning of the shell while the debugging shell would just be #!/bin/bash. The -e sets to exit to the shell when any non zero [0] exit code status.

Since you say the command works when debugging with SSH you can set the shell to use /bin/bash -o pipefail using a default shell options. Here is an example:

  - run:
     name: <<command name>>
     shell: /bin/bash -o pipefail
     command: |
       << some commands>>

Notice that I still added -o pipefail as that prevents errors in a pipeline from being masked.

Checklist

Before you mark the PR ready for review, please make sure that:

• All commits have a clear commit message.
• The PR title is in the form of of <PR type>: <area>: <change being made>
  • example: fix: mempool: Introduce a cache for valid signatures
  • PR type: fix, feat, INTERFACE BREAKING CHANGE, CONSENSUS BREAKING, build, chore, ci, docs,perf, refactor, revert, style, test
  • area: api, chain, state, vm, data transfer, market, mempool, message, block production, multisig, networking, paychan, proving, sealing, wallet, deps
• This PR has tests for new functionality or change in behaviour
• If new user-facing features are introduced, clear usage guidelines and / or documentation updates should be included in https://lotus.filecoin.io or Discussion Tutorials.
• CI is green