Reverts the usage of rangefunc and attempts to keep the foundation of it
in for when we move to go 1.23. We have downstream dependencies that
aren't ready to move to go 1.23. We can likely move after go 1.24 is
released.
Signed-off-by: Jonathan A. Sternberg <jonathan.sternberg@docker.com>
Update the buildflags cty code to handle unknown values. When hcl
decodes a value with an invalid variable name, it appends a diagnostic
for the error and then returns an unknown value so it can continue
processing the file and finding more errors.
The iteration code has now been changed to use a rangefunc from go 1.23
and it skips empty or unknown values. Empty values are valid when they
are skipped and unknown values will have a diagnostic for itself.
Signed-off-by: Jonathan A. Sternberg <jonathan.sternberg@docker.com>
