add default value for BASE_BRANCH var within compare_ci_diff scripts #5703
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Appears as though Buildkite's job-environment scoped $BUILDKITE_PULL_REQUEST_BASE_BRANCH EnvVar is not properly set when builds are triggered against the base branch itself (
develop
in this case) see: example. This change adds a default ofdevelop
, which should result in a no-op, if so.Testing: Buildkite CI
Checklist: