Switch CI Docker image from Miniconda to Miniforge to avoid Anaconda rate limits

Replace Miniconda (which uses Anaconda's rate-limited default package
repository) with Miniforge (which uses conda-forge). This resolves CI
Docker image build failures caused by Anaconda ToS rate limits.

This PR was authored with Claude.

Agent-Logs-Url: https://github.com/pytorch/executorch/sessions/888dd7ec-0404-4883-b99c-d6b54cb95a05

Co-authored-by: kirklandsign <107070759+kirklandsign@users.noreply.github.com>

Author: Copilot

.ci/docker/build.sh

@@ -19,7 +19,7 @@ OS_VERSION=22.04
 CLANG_VERSION=""
 GCC_VERSION=""
 PYTHON_VERSION=3.10
-MINICONDA_VERSION=23.10.0-1
+MINIFORGE_VERSION=24.11.3-0
 BUCK2_VERSION=$(cat ci_commit_pins/buck2.txt)
 
 case "${IMAGE_NAME}" in
@@ -106,7 +106,7 @@ docker build \
   --build-arg "CLANG_VERSION=${CLANG_VERSION}" \
   --build-arg "GCC_VERSION=${GCC_VERSION}" \
   --build-arg "PYTHON_VERSION=${PYTHON_VERSION}" \
-  --build-arg "MINICONDA_VERSION=${MINICONDA_VERSION}" \
+  --build-arg "MINIFORGE_VERSION=${MINIFORGE_VERSION}" \
   --build-arg "TORCH_VERSION=${TORCH_VERSION}" \
   --build-arg "BUCK2_VERSION=${BUCK2_VERSION}" \
   --build-arg "LINTRUNNER=${LINTRUNNER:-}" \

.ci/docker/common/install_conda.sh

@@ -10,19 +10,19 @@ set -ex
 # shellcheck source=/dev/null
 source "$(dirname "${BASH_SOURCE[0]}")/utils.sh"
 
-install_miniconda() {
-  BASE_URL="https://repo.anaconda.com/miniconda"
-  CONDA_FILE="Miniconda3-py${PYTHON_VERSION//./}_${MINICONDA_VERSION}-Linux-x86_64.sh"
+install_miniforge() {
+  BASE_URL="https://github.com/conda-forge/miniforge/releases/download/${MINIFORGE_VERSION}"
+  CONDA_FILE="Miniforge3-${MINIFORGE_VERSION}-Linux-x86_64.sh"
   if [[ $(uname -m) == "aarch64" ]]; then
-    CONDA_FILE="Miniconda3-py${PYTHON_VERSION//./}_${MINICONDA_VERSION}-Linux-aarch64.sh"
+    CONDA_FILE="Miniforge3-${MINIFORGE_VERSION}-Linux-aarch64.sh"
   fi
 
   mkdir -p /opt/conda
   chown ci-user:ci-user /opt/conda
 
   pushd /tmp
   wget -q "${BASE_URL}/${CONDA_FILE}"
-  # Install miniconda
+  # Install miniforge
   as_ci_user bash "${CONDA_FILE}" -b -f -p "/opt/conda"
   # Clean up the download file
   rm "${CONDA_FILE}"
@@ -68,7 +68,7 @@ fix_conda_ubuntu_libstdcxx() {
   fi
 }
 
-install_miniconda
+install_miniforge
 install_python
 install_pip_dependencies
 # Hack breaks the job on aarch64 but is still necessary everywhere

.ci/docker/ubuntu/Dockerfile

@@ -44,7 +44,7 @@ COPY ./common/install_docs_reqs.sh install_docs_reqs.sh
 RUN bash ./install_docs_reqs.sh && rm install_docs_reqs.sh
 
 # Install conda and other dependencies
-ARG MINICONDA_VERSION
+ARG MINIFORGE_VERSION
 ARG PYTHON_VERSION
 ENV PYTHON_VERSION=$PYTHON_VERSION
 ENV PATH /opt/conda/envs/py_$PYTHON_VERSION/bin:/opt/conda/bin:$PATH