ci: reduce test workflow overhead

.github/workflows/tests.yml

@@ -107,6 +107,10 @@ jobs:
       PYTEST_MARKER: ${{ matrix.test-type == 'serial' && 'serial and not benchmark' || 'not serial and not benchmark' }}
 
     steps:
+      # See https://github.com/conda/conda-build/pull/5866 — added to prevent the
+      # Post Cache step from running out of disk space. Trimmed to the entries
+      # that recover meaningful space; browser/editor/language-toolchain folders
+      # were removed as they contribute little to post-test disk pressure.
       - name: Free Disk Space
         uses: endersonmenezes/free-disk-space@7901478139cff6e9d44df5972fd8ab8fcade4db1  # v3.2.2
         with:
@@ -118,25 +122,13 @@ jobs:
           remove_packages: >-
             azure-cli
             google-cloud-cli
-            microsoft-edge-stable
-            google-chrome-stable
-            firefox
             postgresql*
             temurin-*
             *llvm*
-            mysql*
             dotnet-sdk-*
           remove_packages_one_command: true
           remove_folders: >-
-            /usr/share/swift
-            /usr/share/az*
             /usr/local/lib/node_modules
-            /usr/local/share/chromium
-            /usr/local/share/powershell
-            /usr/local/julia
-            /usr/local/aws-cli
-            /usr/local/aws-sam-cli
-            /usr/share/gradle
           rm_cmd: rmz
           rmz_version: 3.1.1
           testing: false
@@ -191,6 +183,10 @@ jobs:
           pytest
           --cov=conda_build
           --durations-path=durations/${{ runner.os }}.json
+          --cov-append
+          --cov-branch
+          --cov-report=term
+          --cov-report=xml
           --reruns 1
           --reruns-delay 1
           -n auto
@@ -387,6 +383,10 @@ jobs:
         run: >
           pytest
           --cov=conda_build
+          --cov-append
+          --cov-branch
+          --cov-report=term
+          --cov-report=xml
           --basetemp=${{ runner.temp }}
           --durations-path=durations\${{ runner.os }}.json
           -n auto
@@ -526,6 +526,10 @@ jobs:
           pytest
           --cov=conda_build
           --durations-path=durations/${{ runner.os }}.json
+          --cov-append
+          --cov-branch
+          --cov-report=term
+          --cov-report=xml
           -n auto
           -m "${{ env.PYTEST_MARKER }}"
         env:

news/ci-test-speed-hygiene.md

@@ -0,0 +1,21 @@
+### Enhancements
+
+* <news item>
+
+### Bug fixes
+
+* <news item>
+
+### Deprecations
+
+* <news item>
+
+### Docs
+
+* <news item>
+
+### Other
+
+* Reduce CI test overhead by moving coverage options out of the global pytest
+  configuration and into the test workflow and trimming the Linux disk-cleanup
+  list.

pyproject.toml

@@ -95,11 +95,10 @@ local_scheme = "dirty-tag"
 [tool.pytest.ini_options]
 addopts = [
   "--color=yes",
-  # "--cov=conda_build",   # passed in test runner scripts instead (avoid debugger)
-  "--cov-append",
-  "--cov-branch",
-  "--cov-report=term",  # print summary table to screen
-  "--cov-report=xml",  # for codecov/codecov-action upload
+  # Coverage options are passed by CI (.github/workflows/tests.yml) so they
+  # don't interfere with local debugging. See the "Run Tests" steps there for
+  # the exact flags used: --cov=conda_build --cov-append --cov-branch
+  # --cov-report=term --cov-report=xml
   "--durations=16",  # show 16 slowest tests
   "--junitxml=junit.xml",
   # "--splitting-algorithm=least_duration",  # not used