use docker

.github/workflows/benchmark.yml

@@ -4,25 +4,13 @@ on: [pull_request, push]
 jobs:
   benchmark:
     runs-on: ubuntu-latest
+    container: dolfinx/dolfinx:stable
 
     steps:
     - name: Checkout code
       uses: actions/checkout@v2
 
-    - name: Set up Conda
-      uses: conda-incubator/setup-miniconda@v2
-      with:
-        activate-environment: myenv
-        mamba-version: "*"
-        channels: conda-forge, defaults
-
-    - name: Create Conda environment
-      shell: bash -l {0}
-      run: |
-        mamba install -c conda-forge fenics-dolfinx
-
     - name: Install local package and dependencies
-      shell: bash -l {0}
       run: |
         pip install .[test]
 
@@ -33,7 +21,6 @@ jobs:
         key: ${{ runner.os }}-benchmark
 
     - name: Run benchmark
-      shell: bash -l {0}
       run: |
         pytest benchmark.py --benchmark-json output.json