Add template for conda packaging

packaging/conda/build.sh

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+#!/usr/bin/env bash
+
+mkdir build
+cd build
+
+# Openmpi Specific environment setup - Cf. https://github.com/conda-forge/libnetcdf-feedstock/pull/80
+export OMPI_MCA_btl=self,tcp
+export OMPI_MCA_plm=isolated
+export OMPI_MCA_rmaps_base_oversubscribe=yes
+export OMPI_MCA_btl_vader_single_copy_mechanism=none
+mpiexec="mpiexec --allow-run-as-root"
+
+source $PREFIX/share/triqsvars.sh
+
+cmake \
+    -DCMAKE_INSTALL_PREFIX=$PREFIX \
+    -DCMAKE_BUILD_TYPE=Release \
+    ..
+
+make -j${CPU_COUNT} VERBOSE=1
+CTEST_OUTPUT_ON_FAILURE=1 ctest
+make install

packaging/conda/conda_build_config.yaml

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+mpi:
+  - mpich
+  - openmpi

packaging/conda/meta.yaml

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+{% set version = "3.0.0" %}
+
+package:
+  name: app4triqs
+  version: {{ version }}
+
+source:
+  url: https://github.com/TRIQS/app4triqs/releases/download/{{ version }}/app4triqs-{{ version }}.tar.gz
+  sha256: PUT HERE THE SHA256 OF YOUR RELEASE TARBALL
+
+build:
+  number: 0
+  skip: True  # [win or py<30]
+
+requirements:
+  build:
+    - cmake
+    - make
+    - {{ compiler('c') }}
+    - {{ compiler('cxx') }}
+  host:
+    - triqs {{ '.'.join(version.split('.')[:2]) }}
+    - boost-cpp
+    - hdf5
+    - {{ mpi }}
+    - libblas
+    - liblapack
+    - python
+  run:
+    - {{ pin_compatible("triqs", max_pin="x.x") }}
+    - boost-cpp
+    - hdf5
+    - {{ mpi }}
+    - libblas
+    - liblapack
+    - python
+
+test:
+  commands:
+    - export OMPI_MCA_btl=self,tcp
+    - export OMPI_MCA_plm=isolated
+    - export OMPI_MCA_rmaps_base_oversubscribe=yes
+    - export OMPI_MCA_btl_vader_single_copy_mechanism=none
+    - export mpiexec="mpiexec --allow-run-as-root"
+    - python -c "import app4triqs"
+
+about:
+  home: https://triqs.github.io/app4triqs
+  license: GPL-3.0-or-later
+  license_family: GPL
+  license_file: LICENSE.txt
+  summary: 'An application based on the TRIQS library'
+
+extra:
+  recipe-maintainers:
+    - wentzell
+    - pgunn