Add SWIFTCI_USE_LOCAL_DEPS build mode #694
Merged
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When building/running Foundation tests in swift-ci as part of a full toolchain test (and not just an isolated test of only Foundation), we want to build this package against the locally checked out versions of our dependencies. This checks a new environment variable
SWIFTCI_USE_LOCAL_DEPSand, when set, will look in sibling directories for our dependencies rather than checking out dependencies from GitHub. This is similar to the setup that some other packages such as swift-format use.