Delete testing part from Docs workflow and only build docs with Python 3.9

Author: seisman

.github/workflows/docs.yml

@@ -1,7 +1,6 @@
-# This workflow installs PyGMT dependencies, build documentation and run tests
-# For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
+# This workflow installs PyGMT, build and deploy documentation
 
-name: Tests
+name: Docs
 
 on:
   push:
@@ -28,7 +27,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.7, 3.8, 3.9]
+        python-version: [3.9]
         os: [ubuntu-latest, macOS-latest, windows-latest]
         # Is it a draft Pull Request (true or false)?
         isDraft:
@@ -46,11 +45,6 @@ jobs:
             python-version: 3.8
             isDraft: true
 
-    # environmental variables used in coverage
-    env:
-      OS: ${{ matrix.os }}
-      PYTHON: ${{ matrix.python-version }}
-
     steps:
       # Cancel previous runs that are not completed
       - name: Cancel Previous Runs
@@ -110,32 +104,11 @@ jobs:
           python setup.py sdist --formats=zip
           pip install dist/*
 
-      # Run the tests
-      - name: Test with pytest
-        shell: bash -l {0}
-        run: make test PYTEST_EXTRA="-r P"
-
-      # Upload diff images on test failure
-      - name: Upload diff images if any test fails
-        uses: actions/upload-artifact@v2
-        if: ${{ failure() }}
-        with:
-          name: artifact-${{ runner.os }}-${{ matrix.python-version }}
-          path: tmp-test-dir-with-unique-name
-
       # Build the documentation
       - name: Build the documentation
         shell: bash -l {0}
         run: make -C doc clean all
 
-      # Upload coverage to Codecov
-      - name: Upload coverage to Codecov
-        uses: codecov/[email protected]
-        with:
-          file: ./coverage.xml # optional
-          env_vars: OS,PYTHON
-          fail_ci_if_error: false
-
       - name: Checkout the gh-pages branch
         uses: actions/checkout@28c7f3d2b5162b5ddd3dfd9a45aa55eaf396478b
         with: