Process rust after switching back to rustbuilder user

Dockerfile

@@ -20,10 +20,6 @@ COPY commands/butler_upload.sh /usr/bin/butler_upload
 
 COPY commands/emsdk_install.sh /usr/bin/emsdk_install
 
-RUN rustup install nightly && \
-    rustup component add rust-src --toolchain nightly && \
-    rustup target add wasm32-unknown-emscripten --toolchain nightly
-
 RUN chmod +x /usr/bin/godot_* /usr/bin/butler_*
 RUN godot_install $GODOT_VERSION $PLATFORM
 RUN butler_install $BUTLER_VERSION
@@ -32,4 +28,10 @@ ENV EMSDK=/usr/bin/emsdk
 RUN emsdk_install "${EMSDK}"
 
 ENV EMSDK_NODE="${EMSDK}/node/20.18.0_64bit/bin/node"
-ENV PATH="${EMSDK}:${EMSDK}/upstream/emscripten:${PATH}"
\ No newline at end of file
+ENV PATH="${EMSDK}:${EMSDK}/upstream/emscripten:${PATH}"
+
+USER rustbuilder
+
+RUN rustup install nightly && \
+    rustup component add rust-src --toolchain nightly && \
+    rustup target add wasm32-unknown-emscripten --toolchain nightly
\ No newline at end of file