[9.18] new: ci: Add a check for defined but never used anchors in .gitlab-ci.yaml

If an new orphan anchor is (`.anchor: &anchor` with no corresponding `*anchor` elsewhere in the file) is introduced the CI job will.

Depends on https://gitlab.isc.org/isc-projects/bind9-qa/-/merge_requests/101 (merge that first and then drop the `--branch` commit).

Backport of MR !10654

Merge branch 'backport-stepan/ci-orphaned-anchors-9.18' into 'bind-9.18'

See merge request isc-projects/bind9!10667

.gitlab-ci.yml

@@ -94,11 +94,6 @@ stages:
 
 ### Runner Tag Templates
 
-.libvirt-amd64: &libvirt_amd64
-  tags:
-    - libvirt
-    - amd64
-
 # Autoscaling GitLab Runner on AWS EC2 (amd64)
 
 .linux-amd64: &linux_amd64
@@ -246,10 +241,6 @@ stages:
     - if: '$CI_PIPELINE_SOURCE =~ /^(api|pipeline|schedule|trigger|web)$/'
     - if: '$CI_COMMIT_TAG != null'
 
-.api-pipelines-schedules-triggers-web-triggering-rules: &api_pipelines_schedules_triggers_web_triggering_rules
-  rules:
-    - if: '$CI_PIPELINE_SOURCE =~ /^(api|pipeline|schedule|trigger|web)$/'
-
 .default-triggering-rules_list: &default_triggering_rules_list
   - if: '$CI_PIPELINE_SOURCE =~ /^(api|merge_request_event|pipeline|schedule|trigger|web)$/'
   - if: '$CI_COMMIT_TAG != null'
@@ -372,8 +363,7 @@ stages:
   <<: *base_image
   stage: performance
   rules:
-    - &shotgun_rule_mr
+    - if: '$CI_MERGE_REQUEST_DIFF_BASE_SHA != null'
-      if: '$CI_MERGE_REQUEST_DIFF_BASE_SHA != null'
       variables:
         BASELINE: '$CI_MERGE_REQUEST_DIFF_BASE_SHA'
     - &shotgun_rule_tag
@@ -447,21 +437,6 @@ stages:
     reports:
       junit: junit.xml
 
-.system_test_legacy: &system_test_legacy
-  script:
-    - cd bin/tests/system
-    - find . -maxdepth 2 -mindepth 2 -type f -name "tests.sh" | cut -d/ -f2 | xargs -n 1 -P ${TEST_PARALLEL_JOBS:-1} sh legacy.run.sh
-    - if git rev-parse > /dev/null 2>&1; then ( ! grep "^I:.*:file.*not removed$" *.log ); fi
-    - '( ! grep -F "grep: warning:" *.log )'
-  after_script:
-    - test -d bind-* && cd bind-*
-    - REALSOURCEDIR="$PWD"
-    - test -n "${OUT_OF_TREE_WORKSPACE}" && cd "${OUT_OF_TREE_WORKSPACE}"
-    - find bin/tests/system -name "*dig.*" | xargs grep "error" || true
-    - *find_python
-    - >
-      "$PYTHON" "$REALSOURCEDIR"/bin/tests/convert-trs-to-junit.py . > "$CI_PROJECT_DIR"/junit.xml
-
 .system_test_make_check: &system_test_make_check_job
   <<: *system_test_job
   # This script needs to: 1) fail if the system tests fail, 2) fail if
@@ -594,7 +569,6 @@ vulture:
     - vulture --exclude "*/ans*/ans.py,conftest.py,get_algorithms.py,isctest" --ignore-names "pytestmark" bin/tests/system/
 
 ci-variables:
-  stage: precheck
   <<: *precheck_job
   script:
     - export BIND_BASELINE_BRANCH="$(sed -n -E "s|^m4_define\(\[bind_VERSION_MINOR\], ([0-9]+)\)dnl$|\1|p" configure.ac)"
@@ -610,6 +584,16 @@ ci-variables:
     reports:
       dotenv: ci_vars.env
 
+ci-orphaned-anchors:
+  <<: *precheck_job
+  script:
+    - git clone --depth 1 https://gitlab.isc.org/isc-projects/bind9-qa.git
+    - bind9-qa/ci-orphaned-anchors/check-orphaned-anchors-ci.py .gitlab-ci.yml
+  needs: []
+  rules:
+    - changes:
+        - .gitlab-ci.yml
+
 clang-format:
   <<: *precheck_job
   needs: []
@@ -1662,9 +1646,6 @@ shotgun:doh-get:
     SHOTGUN_EVAL_THRESHOLD_LATENCY_PCTL_MAX: 0.4  # bump from the default due to increased tail-end jitter
   rules: *shotgun_rules_manual_mr
 
-.stress-test: &stress_test
-  stage: performance
-
 generate-stress-test-configs:
   <<: *base_image
   <<: *default_triggering_rules