fix: added new options needed in Dockerfile according to base-image changelog

.pipeline/Dockerfile.deps

@@ -4,6 +4,11 @@
 ARG BASE_IMAGE=ekidd/rust-musl-builder:stable
 FROM $BASE_IMAGE AS build
 
+# Need to set these to use rustup
+# https://github.com/emk/rust-musl-builder/blob/0dab4b64c7c7f29beff5482643d796ef1db1c35e/CHANGELOG.md
+USER root
+env RUSTUP_HOME=/opt/rust/rustup CARGO_HOME=/opt/rust/cargo
+
 # Download the target for static linking.
 RUN rustup set profile minimal
 RUN rustup target add x86_64-unknown-linux-musl