Use mamba to install Continuous Integration dependencies

.github/workflows/ci_tests.yaml

@@ -40,6 +40,7 @@ jobs:
           - os: macOS-latest
             isDraft: true
           - os: windows-latest
+            python-version: 3.7
             isDraft: true
           # - os: ubuntu-latest
           #   python-version: 3.7
@@ -77,19 +78,23 @@ jobs:
           # fecth all history so that setuptools-scm works
           fetch-depth: 0
 
-      # Setup Miniconda
-      - name: Setup Miniconda
+      # Install Mambaforge with conda-forge dependencies
+      - name: Setup Mambaforge
         uses: conda-incubator/[email protected]
         with:
           activate-environment: pygmt
           python-version: ${{ matrix.python-version }}
-          channels: conda-forge
-          miniconda-version: "latest"
+          channels: conda-forge,nodefaults
+          channel-priority: strict
+          miniforge-version: latest
+          miniforge-variant: Mambaforge
+          mamba-version: "*"
+          use-mamba: true
 
       # Install GMT and other required dependencies from conda-forge
       - name: Install dependencies
         run: |
-          conda install gmt=6.2.0 numpy=${{ matrix.numpy-version }} \
+          mamba install gmt=6.2.0 numpy=${{ matrix.numpy-version }} \
                         pandas xarray netCDF4 packaging \
                         ${{ matrix.optional-packages }} \
                         codecov coverage[toml] dvc ipython make \
@@ -98,7 +103,7 @@ jobs:
 
       # Show installed pkg information for postmortem diagnostic
       - name: List installed packages
-        run: conda list
+        run: mamba list
 
       # Download cached remote files (artifacts) from GitHub
       - name: Download remote data from GitHub

.github/workflows/ci_tests_dev.yaml

@@ -71,19 +71,23 @@ jobs:
           # fecth all history so that setuptools-scm works
           fetch-depth: 0
 
-      # Setup Miniconda
-      - name: Setup Miniconda
+      # Install Mambaforge with conda-forge dependencies
+      - name: Setup Mambaforge
         uses: conda-incubator/[email protected]
         with:
           activate-environment: pygmt
           python-version: ${{ matrix.python-version }}
-          channels: conda-forge
-          miniconda-version: "latest"
+          channels: conda-forge,nodefaults
+          channel-priority: strict
+          miniforge-version: latest
+          miniforge-variant: Mambaforge
+          mamba-version: "*"
+          use-mamba: true
 
       # Install dependencies from conda-forge
       - name: Install dependencies
         run: |
-          conda install ninja cmake libblas libcblas liblapack fftw gdal geopandas \
+          mamba install ninja cmake libblas libcblas liblapack fftw gdal geopandas \
                         ghostscript libnetcdf hdf5 zlib curl pcre make dvc
           pip install --pre numpy pandas xarray netCDF4 packaging \
                             ipython pytest-cov pytest-mpl pytest>=6.0 sphinx-gallery \
@@ -98,7 +102,7 @@ jobs:
         if: runner.os != 'Windows'
 
       - name: Install GMT dev version from conda-forge (Windows)
-        run: conda install -c conda-forge/label/dev gmt
+        run: mamba install -c conda-forge/label/dev gmt>=6.2
         if: runner.os == 'Windows'
 
       # Download cached remote files (artifacts) from GitHub