feat: allow customizing $PATH
during rb_bundle_fetch
#91
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Right now, we're overwriting
$PATH
regardless of what the user specifies inenv
. With this change, we use the user's provided value in addition to adding our own entry.This is necessary for some gems that depend on system binaries. For example, the
pg
gem depends onpg_config
binary.Bazel already adds some standard directories like
/usr/local/bin
to$PATH
. But, that isn't sufficient on recent versions of MacOS because Homebrew stores packages elsewhere (see bazelbuild/bazel#12049).This change allows users who are comfortable with not fully hermetic bundle builds to opt into it by tweaking
$PATH
.