Update GitHub Action workflows to use micromamba (#1493)

- Replace conda setup with micromamba
- Reduce fetch depth for checkout
- Fetch tags for version inference
- Install pvlib from source before testing

Closes #1472

Co-authored-by: Kevin Anderson <kevin.anderson@nrel.gov>

.github/workflows/pytest.yml

@@ -8,7 +8,6 @@ on:
 
 jobs:
   test:
-
     strategy:
       fail-fast: false  # don't cancel other matrix jobs when one fails
       matrix:
@@ -31,16 +30,23 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-      - uses: actions/checkout@v3
+      # We check out only a limited depth and then pull tags to save time
+      - name: Checkout source
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 100
+
+      - name: Get tags
+        run: git fetch --depth=1 origin +refs/tags/*:refs/tags/*
 
-      - name: Set up conda environment
+      - name: Install Conda environment with Micromamba
         if: matrix.environment-type == 'conda'
-        uses: conda-incubator/setup-miniconda@v2
+        uses: mamba-org/provision-with-micromamba@v12
         with:
-          activate-environment: test_env
           environment-file: ${{ env.REQUIREMENTS }}
-          python-version: ${{ matrix.python-version }}
-          auto-activate-base: false
+          cache-downloads: true
+          extra-specs: |
+            python=${{ matrix.python-version }}
         env:
           # build requirement filename.  First replacement is for the python
           # version, second is to add "-min" if needed
@@ -49,14 +55,19 @@ jobs:
       - name: List installed package versions (conda)
         if: matrix.environment-type == 'conda'
         shell: bash -l {0}  # necessary for conda env to be active
-        run: conda list
+        run: micromamba list
 
       - name: Install bare Python ${{ matrix.python-version }}${{ matrix.suffix }}
         if: matrix.environment-type == 'bare'
         uses: actions/setup-python@v1
         with:
           python-version: ${{ matrix.python-version }}
 
+      - name: Install pvlib
+        if: matrix.environment-type == 'conda'
+        shell: bash -l {0}
+        run: python -m pip install --no-deps .
+
       - name: Set up bare environment
         if: matrix.environment-type == 'bare'
         run: |

docs/sphinx/source/whatsnew/v0.9.2.rst

@@ -29,6 +29,7 @@ Bug fixes
 Testing
 ~~~~~~~
 * Switched CI testing provider from Azure to GitHub Actions (:pull:`1306`)
+* Speed up CI setup using micromamba instead of conda (:pull:`1493`)
 
 
 Documentation
@@ -56,3 +57,4 @@ Contributors
 * Prajwal Borkar (:ghuser:`PrajwalBorkar`) 
 * Kevin Anderson (:ghuser:`kanderso-nrel`)
 * Cliff Hansen (:ghuser:`cwhanse`)
+* Jules Chéron (:ghuser:`jules-ch`)