rustPlatform.buildRustPackage: support debug builds

Signed-off-by: Ana Hobden <operator@hoverbear.org>

pkgs/build-support/rust/hooks/cargo-build-hook.sh

@@ -9,6 +9,10 @@ cargoBuildHook() {
         pushd "${buildAndTestSubdir}"
     fi
 
+    if [ "${cargoBuildType}" != "debug" ]; then
+        cargoBuildProfileFlag="--${cargoBuildType}"
+    fi
+
     (
     set -x
     env \
@@ -19,7 +23,7 @@ cargoBuildHook() {
       cargo build -j $NIX_BUILD_CORES \
         --target @rustTargetPlatformSpec@ \
         --frozen \
-        --${cargoBuildType} \
+        ${cargoBuildProfileFlag} \
         ${cargoBuildFlags}
     )
 

pkgs/build-support/rust/hooks/cargo-check-hook.sh

@@ -16,7 +16,11 @@ cargoCheckHook() {
         threads=1
     fi
 
-    argstr="--${cargoCheckType} --target @rustTargetPlatformSpec@ --frozen ${cargoTestFlags}";
+    if [ "${cargoBuildType}" != "debug" ]; then
+        cargoBuildProfileFlag="--${cargoBuildType}"
+    fi
+
+    argstr="${cargoBuildProfileFlag} --target @rustTargetPlatformSpec@ --frozen ${cargoTestFlags}";
 
     (
         set -x