build: fix unintended caching issue

Fixes #1

.repo/build

@@ -36,12 +36,15 @@ for package in "${PACKAGES[@]}"; do
     #
     # rust - crates
     if grep -q "depends = rust\|cargo" <<<"$makepkg_output"; then
-      EXTRA_ARGS+=(--bind-rw /var/cache/cargo:/build/.cargo)
+      EXTRA_ARGS+=(
+        --bind-rw /var/cache/cargo/git:/build/.cargo/git
+        --bind-rw /var/cache/cargo/registry:/build/.cargo/registry
+      )
     fi
 
     # go - modules
     if grep -q "depends = go" <<<"$makepkg_output"; then
-      EXTRA_ARGS+=(--bind-rw /var/cache/golang:/build/go)
+      EXTRA_ARGS+=(--bind-rw /var/cache/golang/pkg:/build/go/pkg)
     fi
 
     # dart - packages