Add github workflow for testing on a crippled filesystem

.github/workflows/test_crippledfs.yml

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+name: crippled-filesystems
+
+on: [pull_request]
+
+jobs:
+  test:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Set up system
+      shell: bash
+      run: |
+        bash <(wget -q -O- http://neuro.debian.net/_files/neurodebian-travis.sh)
+        # enable repo for devel git-annex, if needed
+        #sudo sed -e 's|\(deb.*data\)|#\1|' -e 's|/debian |/debian-devel |' /etc/apt/sources.list.d/neurodebian.sources.list | sudo tee /etc/apt/sources.list.d/neurodebian-devel.sources.list
+        sudo apt-get update -qq
+        sudo apt-get install eatmydata
+        sudo eatmydata apt-get install git-annex-standalone dosfstools
+        # 500 MB VFAT FS in a box
+        sudo dd if=/dev/zero of=/crippledfs.img count=500 bs=1M
+        sudo mkfs.vfat /crippledfs.img
+        # mount
+        sudo mkdir /crippledfs
+        sudo mount -o "uid=$(id -u),gid=$(id -g)" /crippledfs.img /crippledfs
+    - name: Set up environment
+      run: |
+        git config --global user.email "test@github.land"
+        git config --global user.name "GitHub Almighty"
+    - uses: actions/checkout@v1
+    - name: Set up Python 3.5
+      uses: actions/setup-python@v1
+      with:
+        python-version: 3.5
+    - name: Install dependencies
+      run: |
+        pip install -r requirements-devel.txt
+        python -m pip install --upgrade pip
+    - name: Installation
+      run: |
+        # package install
+        python -m pip install .
+    - name: Run tests
+      env:
+        # forces all test repos/paths into the VFAT FS
+        TMPDIR: /crippledfs
+      run: |
+        mkdir -p __testhome__
+        cd __testhome__
+        # give detailed info on actual test setup
+        datalad wtf
+        echo "== mount >>"
+        mount
+        echo "<< mount =="
+        python -m nose -s -v --with-doctest --with-coverage --cover-package datalad_helloworld datalad_helloworld