ci: trim PR/merge-queue test time

Two low-risk cuts targeting the dominant costs in PR test wall-clock:

1. Exclude `job_pydabs_1000_tasks` from the `migrate` and `continue_293`
   invariant tests. The 1000-task scale case is still exercised by `no_drift`;
   running the same scale in two additional variants added ~3 minutes per
   linux/direct test job without incremental coverage.

2. Add `install-pythons-test` Makefile target that installs only the Python
   version actually needed by unit + acceptance tests (3.10), and switch the
   setup-build-environment composite action to use it. The `patchwheel` unit
   test now skips versions not available via `uv python find`, so CI can
   install a subset without failing. Integration runs keep using
   `install-pythons` for the full 3.9-3.13 matrix.

Expected impact: linux/direct ~10min -> ~3-4min, windows/* ~3min off setup.

Co-authored-by: Isaac

Author: pietern

.github/actions/setup-build-environment/action.yml

@@ -38,7 +38,7 @@ runs:
         version: "0.8.9"
 
     - name: Install Python versions for tests
-      run: make install-pythons
+      run: make install-pythons-test
       shell: bash
 
     - name: Install ruff (Python linter and formatter)

Makefile

@@ -74,6 +74,14 @@ checks: tidy ws links
 install-pythons:
 	uv python install 3.9 3.10 3.11 3.12 3.13
 
+# Subset of Python versions needed for unit + acceptance tests in CI.
+# 3.13 is already provided by actions/setup-python; 3.10 is the default for
+# acceptance bundle tests (see acceptance/bundle/test.toml). Integration and
+# scheduled runs still use `install-pythons` to cover the full matrix.
+.PHONY: install-pythons-test
+install-pythons-test:
+	uv python install 3.10
+
 .PHONY: test
 test: test-unit test-acc
 

acceptance/bundle/invariant/continue_293/test.toml

@@ -11,3 +11,7 @@ EnvMatrixExclude.no_vector_search_endpoint = ["INPUT_CONFIG=vector_search_endpoi
 
 # Dotted pipeline configuration keys are not supported on v0.293.0
 EnvMatrixExclude.no_pipeline_config_dots = ["INPUT_CONFIG=pipeline_config_dots.yml.tmpl"]
+
+# The 1000-task scale case is covered by no_drift. Running it here adds ~1.5 min
+# per variant (two full deploys at 1000 tasks) without incremental coverage.
+EnvMatrixExclude.no_pydabs_1000_tasks = ["INPUT_CONFIG=job_pydabs_1000_tasks.yml.tmpl"]

acceptance/bundle/invariant/migrate/test.toml

@@ -19,3 +19,7 @@ EnvMatrixExclude.no_grant_ref = ["INPUT_CONFIG=schema_grant_ref.yml.tmpl"]
 
 # SQL warehouses currently failing with migration with permanent drift. TODO: fix this.
 EnvMatrixExclude.no_sql_warehouse = ["INPUT_CONFIG=sql_warehouse.yml.tmpl"]
+
+# The 1000-task scale case is covered by no_drift. Running it here adds ~1.5 min
+# per variant (deploy + migrate + plan at 1000 tasks) without incremental coverage.
+EnvMatrixExclude.no_pydabs_1000_tasks = ["INPUT_CONFIG=job_pydabs_1000_tasks.yml.tmpl"]

libs/patchwheel/patch_test.go

@@ -145,6 +145,14 @@ func TestPatchWheel(t *testing.T) {
 	for _, py := range pythonVersions {
 		t.Run(py, func(t *testing.T) {
 			t.Parallel()
+
+			// Skip if the interpreter is not available via uv. CI only installs
+			// a subset of versions to keep setup fast; the full matrix is
+			// exercised in integration and scheduled runs.
+			if err := exec.Command("uv", "python", "find", py).Run(); err != nil {
+				t.Skipf("%s not available: %v", py, err)
+			}
+
 			tempDir := t.TempDir()
 
 			projFiles := minimalPythonProject()