CI: Show color output on pytest logs in GitHub Actions

GitHub Actions does not show colour outputs for pytest by default (pytest-dev/pytest#7443), but it can be enabled using `--color=yes` flag.

Author: weiji14

.github/workflows/ci_tests.yaml

@@ -157,7 +157,7 @@ jobs:
 
       # Run the regular tests
       - name: Run tests
-        run: make test PYTEST_EXTRA="-r P -n auto --reruns 2"
+        run: make test PYTEST_EXTRA="-r P -n auto --reruns 2 --color=yes"
 
       # Upload diff images on test failure
       - name: Upload diff images if any test fails

.github/workflows/ci_tests_dev.yaml

@@ -173,7 +173,7 @@ jobs:
 
       # Run the tests
       - name: Test with pytest
-        run: make test PYTEST_EXTRA="-r P -n auto --reruns 2"
+        run: make test PYTEST_EXTRA="-r P -n auto --reruns 2 --color=yes"
         env:
           GMT_LIBRARY_PATH: ${{ runner.temp }}/gmt-install-dir/lib
 

.github/workflows/ci_tests_legacy.yaml

@@ -100,4 +100,4 @@ jobs:
 
       # Run the tests but skip images
       - name: Run tests
-        run: make test_no_images PYTEST_EXTRA="-r P"
+        run: make test_no_images PYTEST_EXTRA="-r P --color=yes"