`name=version=build` syntax expands to `name==version=build`, causing `PackageNotFound` errors

[Jaime Rodríguez-Guerra]

Comes from #285. Check there for full details.

The gist is that there must be a MatchSpec bug that causes issues with the roundtrip required to parse and re-write the environment.yaml (to add the Python version, I guess?). This might be related: conda/conda#9980 (comment)

---

Workflow setup:

    name: Tests with conda/mamba
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        os: ["ubuntu-latest", "macos-latest", "windows-latest"]
    steps:
      - uses: actions/checkout@v3
      - uses: conda-incubator/setup-miniconda@v2
        with:
          python-version: "3.10"
          mamba-version: "*"
          channels: conda-forge,defaults
          channel-priority: true
          environment-file: ./environment_locked_py310.yml

My environment_locked_py310.yml

name: dymoval_dev
channels:
  - conda-forge
  - defaults
dependencies:
  - alabaster=0.7.13=pyhd8ed1ab_0
  - apeye=1.3.0=pyhd8ed1ab_0
  - apeye-core=1.1.2=pyhd8ed1ab_0
  - autodocsumm=0.2.11=pyhd8ed1ab_0
  - babel=2.12.1=pyhd8ed1ab_1
  - beautifulsoup4=4.12.2=pyha770c72_0
  - black=23.3.0=py310hbe9552e_1
  - brotli=1.0.9=h1a8c8d9_8
  - brotli-bin=1.0.9=h1a8c8d9_8
  - brotlipy=0.7.0=py310h8e9501a_1005
  - bzip2=1.0.8=h3422bc3_4
  
  ...

  - xorg-libxau=1.0.9=h27ca646_0
  - xorg-libxdmcp=1.1.3=h27ca646_0
  - xz=5.2.6=h57fd34a_0
  - yaml=0.2.5=h3422bc3_2
  - zipp=3.15.0=pyhd8ed1ab_0
  - zstd=1.5.2=hf913c23_6

The error from github actions:

  /usr/share/miniconda/condabin/conda env update --name test --file /home/runner/work/dymoval/dymoval/setup-miniconda-patched-environment_locked_py310.yml
  Collecting package metadata (repodata.json): ...working... done
  Solving environment: ...working... failed
  Warning: 
  ResolvePackageNotFound: 
    - tk==8.6.12=he1e0b03_0
    - lcms2==2.15=hd835a16_1
    - libaec==1.0.6=hb7217d7_1
    ...

Error: The process '/usr/share/miniconda/condabin/conda' failed with exit code 1

Notice the double equals == in the error message.