Updates rc naming convention in RPM spec

[conorsch]

Status

Ready for review.

Description of Changes

Refs #540. Supersedes and therefore closes #552.

Changes proposed in this pull request:

Following the conventions in [0], we now update both the "Version" and
"Release" fields in order to handle RPMs. Some additional munging of the
"Source0" and "%setup" lines is warranted, as well, to build the correct
filepaths when using a hyphen in the full version spec, e.g. 0.3.0-rc1.

[0] https://docs.fedoraproject.org/en-US/packaging-guidelines/Versioning/#_prerelease_versions

The "version" hasn't yet been bumped in this PR, after testing locally, please append a commit with results of ./update-version.sh 0.3.0-rc1.

Testing

• Versioning scheme makes sense (see discussion in Create staging release candidate #540, cf. Provide release candidate for 0.3.0 series #552)
• Changes from SecureDrop Workstation 0.3.0~rc1 #550 reverted cleanly
• Changes to update_version.sh work as expected:
  • ./update_version.sh 0.3.0-rc1 increments and proper sdist naming for tarball and source location, and the package builds using make dom0-rpm
  • ./update_version.sh 0.3.0-rc2 increments the version correctly, and package builds using make dom0-rpm
  • ./update_version.sh 0.3.0 increments the version correctly, and package builds using make dom0-rpm
• Ensure 0.3.0 > 0.3.0-rc1: Create two rpms and observe the output of dnf install $RPM and observe the upgrade/downgrade message at the confirmation prompt.
• The resulting rpm on this branch works in dom0 (sudo dnf install and ./securedrop-admin --apply)

Checklist

If you have made code changes

• Linter (make flake8) passes in the development environment (this box may
  be left unchecked, as flake8 also runs in CI)

If you have made changes to the provisioning logic

• All tests (make test) pass in dom0 of a Qubes install

• This PR adds/removes files, and includes required updates to the packaging
  logic in MANIFEST.in and rpm-build/SPECS/securedrop-workstation-dom0-config.spec

[emkll]

Thanks @conorsch changes look good to me. I'll let you review/comment/merge as I've appended the 0.3.0-rc1 release commit and associated changelog. Tested as follows:

• Versioning scheme makes sense (see discussion in Create staging release candidate #540, cf. Provide release candidate for 0.3.0 series #552)
• Changes from SecureDrop Workstation 0.3.0~rc1 #550 reverted cleanly
• Changes to update_version.sh work as expected:
  • ./update_version.sh 0.3.0-rc1 increments and proper sdist naming for tarball and source location, and the package builds using make dom0-rpm
  • ./update_version.sh 0.3.0-rc2 increments the version correctly, and package builds using make dom0-rpm
  • ./update_version.sh 0.3.0 increments the version correctly, and package builds using make dom0-rpm
• Ensure 0.3.0 > 0.3.0-rc1 > 0.3.0-rc2: Created three rpms and observe the output of dnf install $RPM and observe the upgrade/downgrade message at the confirmation prompt.
• The resulting rpm on this branch works in dom0 (sudo dnf install and ./securedrop-admin --apply)

[conorsch]

Looks great, @emkll. After visually reviewing your additions, I bumped versions locally and confirmed upgrade/downgrade behavior:

• 0.3.0-rc1 -> 0.3.0-rc2 -> 0.3.0 showed "upgrade" in dnf output
• 0.3.0 -> 0.3.0-rc2 -> 0.3.0-rc1 showed "downgrade" in dnf output

Proceeding with merge, then we'll submit a follow-up PR to https://github.com/freedomofpress/securedrop-workstation-dev-rpm-packages-lfs (in particular, see freedomofpress/securedrop-yum-test#8 for reference).