In .github/workflows/main.yml, for the linux_build job, the variable
BUILD_FOR_DISTRIBUTION is set to the string "true" or "false" on CI.
Later, in CI/linux/03_package_obs.sh, we perform a boolean check on
this variable. However, "false" will evaluate as true, because it is a
non-null string. This was causing CI Linux packages to always build as
if BUILD_FOR_DISTRIBUTION was enabled, which caused the git commit hash
to be omitted from package filenames.
Since we know the expected values, let's just test directly if the
variable equals "true" to get the expected behavior.
Hardcode short hash length to 9 characters in CI and packaging scripts.
It is not guaranteed that short hashes are the same length across
different platforms or different versions of git. This caused problems
with upload/download action names, as the hashes sometimes didn't match.
Fix the download artifact name in the Windows installer job and the
macOS notarization job to prevent them from failing due to a name
mismatch.
