gitlab-ci: Fix parallel process limit

Split `build-test FVP` jobs to reduce the number of parallel processes
as it exceeds Gitlab 50 limit.

Signed-off-by: Hugues Kamba-Mpiana <hugues.kambampiana@arm.com>

.gitlab-ci.yml

@@ -90,29 +90,31 @@ license:
   rules:
     - if: $UPDATE_SDK_COMPONENTS != "true"
 
-build-test FVP:
+# This fragment contains base variables required by a pipeline.
+# It can be used to set matrix parameters and extended using << : .anchor syntax
+.pipeline_matrix: &pipeline_matrix
+  TEST: [
+    examples/aws-client,
+    examples/azure-sdk,
+    examples/cmsis-lwip,
+    examples/cmsis-rtos-api,
+    examples/freertos-api,
+    examples/littlefs,
+    examples/mbedtls,
+    examples/pigweed-log,
+    examples/tf-m,
+    tests/cmsis-lwip,
+    tests/tf-m
+  ]
+  PLATFORM: [corstone-300, corstone-310]
+  TOOLCHAIN: [armclang, arm-none-eabi-gcc]
+
+.build-test-fvp-base:
   stage:
     build_and_test
   trigger:
     include: .gitlab/ci/pipeline/pipelines_per_target/fvp.yml
     strategy: depend
-  parallel:
-    matrix:
-      - TEST: [
-            examples/aws-client,
-            examples/azure-sdk,
-            examples/cmsis-lwip,
-            examples/cmsis-rtos-api,
-            examples/freertos-api,
-            examples/littlefs,
-            examples/mbedtls,
-            examples/pigweed-log,
-            examples/tf-m,
-            tests/cmsis-lwip,
-            tests/tf-m
-        ]
-        TOOLCHAIN: [arm-none-eabi-gcc, armclang]
-        PLATFORM: [corstone-300, corstone-310]
   variables:
     TEST: $TEST
     TOOLCHAIN: $TOOLCHAIN
@@ -120,6 +122,22 @@ build-test FVP:
   rules:
     - if: $UPDATE_SDK_COMPONENTS != "true"
 
+build-test-fvp-armclang:
+  extends: .build-test-fvp-base
+  parallel:
+    matrix:
+     -
+      << : *pipeline_matrix
+      TOOLCHAIN: [armclang]
+
+build-test-fvp-gcc:
+  extends: .build-test-fvp-base
+  parallel:
+    matrix:
+     -
+      << : *pipeline_matrix
+      TOOLCHAIN: [arm-none-eabi-gcc]
+
 mirror:
   extends:
     - .sync-public