CI: use conda incubator in benchmarks

.github/workflows/ci.yml

@@ -2,7 +2,7 @@ name: CI
 
 on:
   push:
-    branches: master
+    branches: [master]
   pull_request:
     branches:
       - master
@@ -15,61 +15,70 @@ jobs:
   checks:
     name: Checks
     runs-on: ubuntu-latest
-    steps:
-
-    - name: Setting conda path
-      run: echo "${HOME}/miniconda3/bin" >> $GITHUB_PATH
+    defaults:
+      run:
+        shell: bash -l {0}
 
+    steps:
     - name: Checkout
       uses: actions/checkout@v1
 
     - name: Looking for unwanted patterns
       run: ci/code_checks.sh patterns
       if: always()
 
-    - name: Setup environment and build pandas
-      run: ci/setup_env.sh
-      if: always()
+    - name: Cache conda
+      uses: actions/cache@v1
+      env:
+        CACHE_NUMBER: 0
+      with:
+        path: ~/conda_pkgs_dir
+        key: ${{ runner.os }}-conda-${{ env.CACHE_NUMBER }}-${{
+          hashFiles('${{ env.ENV_FILE }}') }}
 
-    - name: Linting
+    - uses: conda-incubator/setup-miniconda@v2
+      with:
+        activate-environment: pandas-dev
+        channel-priority: strict
+        environment-file: ${{ env.ENV_FILE }}
+        use-only-tar-bz2: true
+
+    - name: Environment Detail
       run: |
-        source activate pandas-dev
-        ci/code_checks.sh lint
+        conda info
+        conda list
+
+    - name: Build Pandas
+      run: |
+        python setup.py build_ext -j 2
+        python -m pip install -e . --no-build-isolation --no-use-pep517
+
+    - name: Linting
+      run: ci/code_checks.sh lint
       if: always()
 
     - name: Checks on imported code
-      run: |
-        source activate pandas-dev
-        ci/code_checks.sh code
+      run: ci/code_checks.sh code
       if: always()
 
     - name: Running doctests
-      run: |
-        source activate pandas-dev
-        ci/code_checks.sh doctests
+      run: ci/code_checks.sh doctests
       if: always()
 
     - name: Docstring validation
-      run: |
-        source activate pandas-dev
-        ci/code_checks.sh docstrings
+      run: ci/code_checks.sh docstrings
       if: always()
 
     - name: Typing validation
-      run: |
-        source activate pandas-dev
-        ci/code_checks.sh typing
+      run: ci/code_checks.sh typing
       if: always()
 
     - name: Testing docstring validation script
-      run: |
-        source activate pandas-dev
-        pytest --capture=no --strict-markers scripts
+      run: pytest --capture=no --strict-markers scripts
       if: always()
 
     - name: Running benchmarks
       run: |
-        source activate pandas-dev
         cd asv_bench
         asv check -E existing
         git remote add upstream https://github.com/pandas-dev/pandas.git
@@ -91,26 +100,45 @@ jobs:
   web_and_docs:
     name: Web and docs
     runs-on: ubuntu-latest
-    steps:
-
-    - name: Setting conda path
-      run: echo "${HOME}/miniconda3/bin" >> $GITHUB_PATH
+    defaults:
+      run:
+        shell: bash -l {0}
 
+    steps:
     - name: Checkout
       uses: actions/checkout@v1
 
-    - name: Setup environment and build pandas
-      run: ci/setup_env.sh
+    - name: Cache conda
+      uses: actions/cache@v1
+      env:
+        CACHE_NUMBER: 0
+      with:
+        path: ~/conda_pkgs_dir
+        key: ${{ runner.os }}-conda-${{ env.CACHE_NUMBER }}-${{
+          hashFiles('${{ env.ENV_FILE }}') }}
 
-    - name: Build website
+    - uses: conda-incubator/setup-miniconda@v2
+      with:
+        activate-environment: pandas-dev
+        channel-priority: strict
+        environment-file: ${{ env.ENV_FILE }}
+        use-only-tar-bz2: true
+
+    - name: Environment Detail
       run: |
-        source activate pandas-dev
-        python web/pandas_web.py web/pandas --target-path=web/build
+        conda info
+        conda list
 
-    - name: Build documentation
+    - name: Build Pandas
       run: |
-        source activate pandas-dev
-        doc/make.py --warnings-are-errors | tee sphinx.log ; exit ${PIPESTATUS[0]}
+        python setup.py build_ext -j 2
+        python -m pip install -e . --no-build-isolation --no-use-pep517
+
+    - name: Build website
+      run: python web/pandas_web.py web/pandas --target-path=web/build
+
+    - name: Build documentation
+      run: doc/make.py --warnings-are-errors | tee sphinx.log ; exit ${PIPESTATUS[0]}
 
     # This can be removed when the ipython directive fails when there are errors,
     # including the `tee sphinx.log` in te previous step (https://github.com/ipython/ipython/issues/11547)