.gitlab-ci: Disable toolchains

meta-zephyr's CI doesn't use them so far and it causes yaml merging
issues

Signed-off-by: Pavel Zhukov <pavel.zhukov@huawei.com>

.gitlab-ci.yml

@@ -3,7 +3,8 @@
 
 stages:
   - compliance
-  - build
+  - build-gcc
+  - build-clang
   - test
   - report
 
@@ -35,37 +36,16 @@ reuse:
 .workspace:
   variables:
     CI_ONIRO_GIT_REPO_PATH: meta-zephyr
+  rules:
+    - if: "$CI_ONIRO_BUILD_FLAVOUR == 'linux'"
+      when: never
+    - if: "$CI_ONIRO_BUILD_FLAVOUR == 'freertos'"
+      when: never
+    - when: on_success
 
 # Disable Linux and FreeRTOS builds that are unlikely to be affected by Zephyr
 # changes and certainly save some time. Some jobs no longer use the
 # .build-$flavour base so they are disabled separately.
-.build-linux:
-  rules:
-    - when: never
-
-.build-linux-matrix:
-  rules:
-    - when: never
-
-.build-wic-image:
-  rules:
-    - when: never
-
-.build-freertos:
-  rules:
-    - when: never
-
-linux-qemu-x86:
-  rules:
-    - when: never
-
-linux-qemu-x86_64:
-  rules:
-    - when: never
-
-linux-raspberrypi4-64:
-  rules:
-    - when: never
 
 # Run lava test and report jobs for scheduled pipeline only.
 .lava-test:
@@ -85,7 +65,7 @@ linux-raspberrypi4-64:
 ## Submit jobs to LAVA
 ##
 lava-zephyr-96b-nitrogen-tests:
-  needs: [zephyr-96b-nitrogen-tests]
+  needs: [zephyr-96b-nitrogen-tests-gcc]
   stage: test
   extends: .lava-test
   variables:
@@ -94,7 +74,7 @@ lava-zephyr-96b-nitrogen-tests:
     CI_REPORT_JOB_NAME: lava-report
 
 lava-zephyr-qemu-cortex-m3:
-  needs: [zephyr-qemu-cortex-m3]
+  needs: [zephyr-qemu-cortex-m3-gcc]
   stage: test
   extends: .lava-test
   variables:
@@ -103,7 +83,7 @@ lava-zephyr-qemu-cortex-m3:
     CI_REPORT_JOB_NAME: lava-report
 
 lava-zephyr-qemu-x86:
-  needs: [zephyr-qemu-x86]
+  needs: [zephyr-qemu-x86-gcc]
   stage: test
   extends: .lava-test
   variables: