ci: avoid a global before_script definition

This removes the implicit assumption that all jobs are test runs.

Differential Revision: https://phab.mercurial-scm.org/D9723

contrib/heptapod-ci.yml

@@ -4,6 +4,12 b' stages:'
 
 image: registry.heptapod.net/mercurial/ci-images/mercurial-core
 
+variables:
+    PYTHON: python
+    TEST_HGMODULEPOLICY: "allow"
+
+.runtests_template: &runtests
+    stage: tests
 # The runner made a clone as root.
 # We make a new clone owned by user used to run the step.
 before_script:
@@ -13,13 +19,6 b' before_script:'
     - cargo build
     - cd /tmp/mercurial-ci/
     - ls -1 tests/test-check-*.* > /tmp/check-tests.txt
-
-variables:
-    PYTHON: python
-    TEST_HGMODULEPOLICY: "allow"
-
-.runtests_template: &runtests
-    stage: tests
     script:
         - echo "python used, $PYTHON"
         - echo "$RUNTEST_ARGS"