Test lower limits of dependencies

.ci_support/environment-old.yml

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+channels:
+- conda-forge
+dependencies:
+- aimsgb =1.0.2
+- ase =3.20.1
+- matplotlib-base =3.5.3
+- nglview =2.7.7
+- numpy =1.23.5
+- phonopy =2.16.2
+- plotly =4.14.3
+- pymatgen =2022.2.1
+- pyscal =2.10.4
+- pyxtal =0.5.5
+- scikit-learn =1.2.1
+- scipy =1.9.3
+- spglib =1.16.5
+- sqsgenerator =0.2

.github/workflows/unittests_old.yml

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+# This workflow is used to run the unittest of pyiron
+
+name: Unittest Lower Bound
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Setup Mambaforge
+      uses: conda-incubator/setup-miniconda@v2
+      with:
+        python-version: '3.9'
+        miniforge-variant: Mambaforge
+        channels: conda-forge
+        channel-priority: strict
+        activate-environment: my-env
+        use-mamba: true
+    - name: Update environment
+      run: mamba env update -n my-env -f .ci_support/environment-old.yml
+    - name: Setup
+      shell: bash -l {0}
+      run: pip install --no-deps .
+    - name: Test
+      shell: bash -l {0}
+      timeout-minutes: 30
+      run: python -m unittest discover tests