Make CI more reliable

Author: ZzEeKkAa

.github/actions/setup-numba-dpex/action.yml

@@ -9,15 +9,31 @@ inputs:
   environment-name:
     description: Environment name
     default: work-env
+  python-version:
+    description: Python version
+    default: 3.9
 runs:
   using: "composite"
   steps:
+    - name: Cache conda
+      uses: actions/cache@v2
+      env:
+        # Increase this value to reset cache if etc/example-environment.yml has not changed
+        CACHE_NUMBER: 0
+      with:
+        path: ~/conda_pkgs_dir
+        key:
+          ${{ runner.os }}-conda-${{ env.CACHE_NUMBER }}-${{
+          inputs.python-version }}-${{ hashFiles('${{ inputs.environment }}') }}
     - uses: conda-incubator/setup-miniconda@v2
       with:
-        python-version: 3.9
+        python-version: ${{ inputs.python-version }}
+        miniforge-variant: Mambaforge
+        miniforge-version: latest
         activate-environment: "${{ inputs.environment-name }}"
         channel-priority: "disabled"
         environment-file: "${{ inputs.environment }}"
+        # use-only-tar-bz2: true # IMPORTANT: This needs to be set for caching to work properly!
 
     - name: Test conda environment
       shell: bash -l {0}