Fix broken bash version evaluation in Dockerfile (#211)

# Description

Tiny PR to fix bash evaluation of ISAACSIM_VERSION in Dockerfile.
Before, it would fail and streaming from Isaac2022.2.1 would fail.

## Type of change

- Bug fix (non-breaking change which fixes an issue)

## Checklist

- [x] I have run the [`pre-commit` checks](https://pre-commit.com/) with
`./orbit.sh --format`
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] I have updated the changelog and the corresponding version in the
extension's `config/extension.toml` file

docker/Dockerfile

@@ -10,6 +10,9 @@
 ARG ISAACSIM_VERSION
 FROM nvcr.io/nvidia/isaac-sim:${ISAACSIM_VERSION}
 
+# Set default RUN shell to bash
+SHELL ["/bin/bash", "-c"]
+
 # Adds labels to the Dockerfile
 LABEL version="1.0"
 LABEL description="Dockerfile for building and running the Orbit framework inside Isaac Sim container image."
@@ -17,6 +20,7 @@ LABEL description="Dockerfile for building and running the Orbit framework insid
 # Arguments
 # Path to Isaac Sim root folder
 ARG ISAACSIM_PATH
+ARG ISAACSIM_VERSION
 
 # Set environment variables
 ENV LANG=C.UTF-8