chore: fix devcontainer image brace expansion

Author: dsisco11

.devcontainer/Dockerfile

@@ -1,6 +1,7 @@
 FROM mcr.microsoft.com/devcontainers/typescript-node:22
 # The default username for most devcontainer-base-images is 'vscode', but the typescript-node image uses 'node'.
 ARG USERNAME=node
+SHELL ["/bin/bash", "-c"]
 
 RUN rm -f /etc/apt/apt.conf.d/docker-clean; echo 'Binary::apt::APT::Keep-Downloaded-Packages "true";' > /etc/apt/apt.conf.d/keep-cache
 RUN --mount=type=cache,target=/var/cache/apt \