v0.28.0-rc8

What's Changed

• fix(exec): re-order script and substitute and skip empty masked outputs by @ecrupper in #691
• enhance: fetch scm auth for step containers with git configs by @ecrupper in #693
• chore(deps): bump server and sdk to latest rc by @ecrupper in #694
• fix(deps): update all non-major dependencies by @renovate[bot] in #692

Full Changelog: v0.28.0-rc7...v0.28.0-rc8