Adjust the differences between v9_16 and v9_11 GitLab CI job configuration

(cherry picked from commit f801f0f926)

.gitlab-ci.yml

@@ -54,6 +54,11 @@ stages:
     - linux
     - amd64
 
+.linux-arm64: &linux_arm64
+  tags:
+    - linux
+    - arm64
+
 .linux-i386: &linux_i386
   tags:
     - linux
@@ -104,6 +109,10 @@ stages:
   image: "$CI_REGISTRY_IMAGE:debian-sid-amd64"
   <<: *linux_amd64
 
+.debian-sid-arm64: &debian_sid_arm64_image
+  image: "$CI_REGISTRY_IMAGE:debian-sid-arm64"
+  <<: *linux_arm64
+
 .debian-sid-i386: &debian_sid_i386_image
   image: "$CI_REGISTRY_IMAGE:debian-sid-i386"
   <<: *linux_i386
@@ -290,9 +299,9 @@ stages:
     expire_in: "1 day"
     when: on_failure
   only:
+    - schedules
     - tags
     - web
-    - schedules
 
 .unit_test: &unit_test_job
   <<: *default_triggering_rules
@@ -593,7 +602,7 @@ scan-build:
   <<: *base_image
   stage: postcheck
   variables:
-    CC: clang-9
+    CC: "${CLANG}"
     CFLAGS: "${CFLAGS_COMMON}"
     CONFIGURE: "${SCAN_BUILD} ./configure"
     EXTRA_CONFIGURE: "--enable-dnstap --with-libidn2"