Native: move copying of toolchain builder artifact from Docker to host

Don't make Docker container copy artifact to a host directory mounted
with -v, because this fails due to a file permission issue:
build is run by a regular user, but the volume directory inside the
container is owned by root.

Instead, make the host copy the artifact from the container.

Also, make the container print the artifact path before that.
Just in case, in order to easily copy file manually, should something
go wrong.

^KT-58864

kotlin-native/tools/toolchain_builder/build_toolchain.sh

@@ -43,7 +43,9 @@ build_archive() {
   mv "$TARGET" "$FULL_NAME"
   ARCHIVE_NAME="$FULL_NAME.tar.gz"
   tar -czvf "$ARCHIVE_NAME" "$FULL_NAME"
-  cp "$ARCHIVE_NAME" /artifacts/"$ARCHIVE_NAME"
+  echo "$PWD/$ARCHIVE_NAME"
+  mkdir -p ~/artifacts
+  cp "$ARCHIVE_NAME" ~/artifacts/"$ARCHIVE_NAME"
 }
 
 echo "building toolchain for $TARGET"

kotlin-native/tools/toolchain_builder/run_container.sh

@@ -12,9 +12,13 @@ docker ps -a | grep $CONTAINER_NAME > /dev/null \
   && docker rm $CONTAINER_NAME > /dev/null
 
 echo "Running build script in container..."
-docker run -v "$PWD"/artifacts:/artifacts \
+docker run \
   --env TARGET="$TARGET" \
   --env VERSION="$VERSION" \
   --env TOOLCHAIN_VERSION_SUFFIX="$TOOLCHAIN_VERSION_SUFFIX" \
   --name=$CONTAINER_NAME $IMAGE_NAME
+
+mkdir -p artifacts
+docker cp kotlin-toolchain-builder:"/home/ct/x-tools/$TARGET-$VERSION-$TOOLCHAIN_VERSION_SUFFIX.tar.gz" artifacts/
+
 echo "Done."