Parallel gqlgen instances race on the Go build cache, causing
Rewriter.getSource() to panic with "slice bounds out of range"
when go/packages returns empty source. Chain gqlgen targets with
order-only prerequisites in the Makefile and switch the CI build
job to sequential generation.
Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>
f7070c43a4