Implements builds for Apple Silicon

This MR introduces support for building our packages on Apple Silicon. We currently use the M1-macmini available.

bob/devtools/data/gitlab-ci/base-build.yaml

-# This YAML file contains descriptions for the CI of most of our Bob/BEAT/BATL
-# packages - do **not** modify it unless you know what you're doing (and up
-# to!)
-
-# Definition of global variables (all stages)
-variables:
-  PYTHONUNBUFFERED: "1"
-  CONDA_ROOT: "${CI_PROJECT_DIR}/miniconda"
-  BOOTSTRAP: "https://gitlab.idiap.ch/bob/bob.devtools/raw/master/bob/devtools/bootstrap.py"
-
-
-# Definition of our build pipeline order
-stages:
-  - build
-
-
-# Build targets
-.build_template:
-  stage: build
-  script:
-    - curl --silent "${BOOTSTRAP}" --output "bootstrap.py"
-    - python3 bootstrap.py -vv channel base
-    - source ${CONDA_ROOT}/etc/profile.d/conda.sh
-    - conda activate base
-    - conda clean --all
-    - bdt ci base-build -vv nopython.txt
-    - bdt ci base-build -vv python.txt
-    - '[ "${CI_COMMIT_REF_NAME}" = "master" ] && bdt ci base-deploy -vv'
-    - bdt ci clean -vv
-
-
-build_linux:
-  extends: .build_template
-  tags:
-    - bob
-    - docker
-  image: quay.io/condaforge/linux-anvil-cos7-x86_64
-  cache:
-    key: "linux-cache"
-
-
-build_macos_intel:
-  extends: .build_template
-  tags:
-    - bob
-    - macos
-    - intel
-  cache:
-    key: "macos-intel-cache"