Configurable conda/mamba channel_alias for runtime builds (#11516)

Co-authored-by: openhands <openhands@all-hands.dev>

openhands/runtime/utils/runtime_build.py

@@ -52,12 +52,16 @@ def _generate_dockerfile(
     )
     template = env.get_template('Dockerfile.j2')
 
+    # Allow overriding conda/mamba channel alias (e.g., to avoid anaconda.org)
+    channel_alias = os.getenv('OH_CONDA_CHANNEL_ALIAS', '').strip() or None
+
     dockerfile_content = template.render(
         base_image=base_image,
         build_from_scratch=build_from == BuildFromImageType.SCRATCH,
         build_from_versioned=build_from == BuildFromImageType.VERSIONED,
         extra_deps=extra_deps if extra_deps is not None else '',
         enable_browser=enable_browser,
+        channel_alias=channel_alias,
     )
     return dockerfile_content
 

openhands/runtime/utils/runtime_templates/Dockerfile.j2

@@ -275,6 +275,9 @@ RUN \
 RUN mkdir -p /openhands/micromamba/bin && \
     /bin/bash -c "PREFIX_LOCATION=/openhands/micromamba BIN_FOLDER=/openhands/micromamba/bin INIT_YES=no CONDA_FORGE_YES=yes $(curl -L https://micro.mamba.pm/install.sh)" && \
     /openhands/micromamba/bin/micromamba config remove channels defaults && \
+    {%- if channel_alias %}
+    /openhands/micromamba/bin/micromamba config set channel_alias '{{ channel_alias }}' && \
+    {%- endif %}
     /openhands/micromamba/bin/micromamba config list && \
     chown -R openhands:openhands /openhands/micromamba && \
     # Create read-only shared access to micromamba for all users