First version I'd be comfortable merging

.github/workflows/fbf-test.yaml

@@ -0,0 +1,70 @@
+on:
+  pull_request:
+  workflow_dispatch:
+env:
+  CONDA_TYPE: Mambaforge
+  CONDA_VERSION: 23.1.0-1
+  CONDA_PATH: /opt/conda
+  CONDA_CACHEBUST: 1
+  FBF_ENV_CACHEBUST: 1
+jobs:
+  test:
+    name: fbf-test
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: restore miniconda cache
+        id: restore-miniconda
+        uses: actions/cache/restore@v3
+        with:
+          path: ${{env.CONDA_PATH}}
+          key: miniconda-${{env.CONDA_TYPE}}-${{env.CONDA_VERSION}}-${{env.CONDA_CACHEBUST}}
+
+      # I tried and rejected the existing setup-miniconda action,
+      # because it wipes out a bunch of files like ~/.profile,
+      # ~/.bashrc, ~/.bash_profile in a way that (a) won't interact
+      # well with other actions that also need to modify the shell
+      # environment, and (b) doesn't play well with caching (you can't
+      # cache the deletion of a file). Also this way seems to take
+      # about half the time (though that might just be random
+      # variation).
+      - name: download miniconda
+        run: curl -L --no-progress-meter -o miniconda-installer.sh "https://github.com/conda-forge/miniforge/releases/download/${{env.CONDA_VERSION}}/${{env.CONDA_TYPE}}-${{env.CONDA_VERSION}}-Linux-x86_64.sh"
+        if: steps.restore-miniconda.outputs.cache-hit != 'true'
+
+      - name: run miniconda installer
+        run: bash miniconda-installer.sh -b -p ${{env.CONDA_PATH}}
+        if: steps.restore-miniconda.outputs.cache-hit != 'true'
+
+      - name: clean up miniconda to reduce cache size
+        run: rm miniconda-installer.sh && source ${{env.CONDA_PATH}}/etc/profile.d/conda.sh && conda clean -afy
+        if: steps.restore-miniconda.outputs.cache-hit != 'true'
+
+      - name: save miniconda cache
+        uses: actions/cache/save@v3
+        with:
+          path: ${{env.CONDA_PATH}}
+          key: miniconda-${{env.CONDA_TYPE}}-${{env.CONDA_VERSION}}-${{env.CONDA_CACHEBUST}}
+        if: steps.restore-miniconda.outputs.cache-hit != 'true'
+
+      - name: restore fbfmaproom conda environment cache
+        id: restore-fbfmaproom-env
+        uses: actions/cache/restore@v3
+        with:
+          path: ${{env.CONDA_PATH}}/envs/fbfmaproom
+          key: fbfmaproom-env-${{ hashFiles('fbfmaproom/conda-linux-64.lock') }}-${{env.CONDA_CACHEBUST}}-${{env.FBF_ENV_CACHEBUST}}
+
+      - name: install fbfmaproom dependencies
+        run: source ${{env.CONDA_PATH}}/etc/profile.d/conda.sh && mamba create -n fbfmaproom --file fbfmaproom/conda-linux-64.lock
+        if: steps.restore-fbfmaproom-env.outputs.cache-hit != 'true'
+
+      - name: save fbfmaproom conda environment cache
+        uses: actions/cache/save@v3
+        with:
+          path: ${{env.CONDA_PATH}}/envs/fbfmaproom
+          key: fbfmaproom-env-${{ hashFiles('fbfmaproom/conda-linux-64.lock') }}-${{env.CONDA_CACHEBUST}}-${{env.FBF_ENV_CACHEBUST}}
+        if: steps.restore-fbfmaproom-env.outputs.cache-hit != 'true'
+
+      - name: run fbf tests
+        run: source ${{env.CONDA_PATH}}/etc/profile.d/conda.sh && conda activate fbfmaproom && cd fbfmaproom && CONFIG=fbfmaproom-sample.yaml python -m pytest tests/test_pingrid.py