[ci] build runtime only if runtime files were changed

.gitlab-ci.yml

@@ -234,7 +234,7 @@ build-test-parachain:
   variables:
     # Enable debug assertions since we are running optimized builds for testing
     # but still want to have debug assertions.
-    RUSTFLAGS: "-Cdebug-assertions=y -Dwarnings"
+    RUSTFLAGS:                     "-Cdebug-assertions=y -Dwarnings"
   # this is an artificial job dependency, for pipeline optimization using GitLab's DAGs
   needs:
     - job:                         check-rustdoc
@@ -248,9 +248,81 @@ build-test-parachain:
     - mkdir -p ./artifacts/zombienet
     - mv ./target/release/wbuild/cumulus-test-runtime/wasm_binary_spec_version_incremented.rs.compact.compressed.wasm ./artifacts/zombienet/.
 
+# build runtime only if files in $RUNTIME_PATH/$RUNTIME_NAME were changed
+.build-runtime-template:           &build-runtime-template
+  stage:                           build
+  <<:                              *docker-env
+  needs:
+    - job:                         check-rustdoc
+      artifacts:                   false
+  variables:
+    RUNTIME_PATH:                  "parachains/runtimes/assets"
+    RUNTIME_NAME:                  "statemine"
+  rules:
+    - if: $CI_COMMIT_REF_NAME =~ /^[0-9]+$/                         # PRs
+      changes:
+        - $RUNTIME_PATH/$RUNTIME_NAME/**/*
+  script:
+    - cd ${RUNTIME_PATH}/${RUNTIME_NAME}
+    - SKIP_WASM_BUILD=1 cargo check
+
+build-runtime-assets-statemine:
+  <<: *build-runtime-template
+  variables:
+    RUNTIME_PATH:                  "parachains/runtimes/assets"
+    RUNTIME_NAME:                  "statemine"
+
+build-runtime-assets-statemint:
+  <<: *build-runtime-template
+  variables:
+    RUNTIME_PATH:                  "parachains/runtimes/assets"
+    RUNTIME_NAME:                  "statemint"
+
+build-runtime-assets-westmint:
+  <<: *build-runtime-template
+  variables:
+    RUNTIME_PATH:                  "parachains/runtimes/assets"
+    RUNTIME_NAME:                  "westmint"
+
+build-runtime-collectives-collectives-polkadot:
+  <<: *build-runtime-template
+  variables:
+    RUNTIME_PATH:                  "parachains/runtimes/collectives"
+    RUNTIME_NAME:                  "collectives-polkadot"
+
+build-runtime-contracts-contracts-rococo:
+  <<: *build-runtime-template
+  variables:
+    RUNTIME_PATH:                  "parachains/runtimes/contracts"
+    RUNTIME_NAME:                  "contracts-rococo"
+
+build-runtime-starters-shell:
+  <<: *build-runtime-template
+  variables:
+    RUNTIME_PATH:                  "parachains/runtimes/starters"
+    RUNTIME_NAME:                  "shell"
+
+build-runtime-starters-seedling:
+  <<: *build-runtime-template
+  variables:
+    RUNTIME_PATH:                  "parachains/runtimes/starters"
+    RUNTIME_NAME:                  "seedling"
+
+build-runtime-testing-penpal:
+  <<: *build-runtime-template
+  variables:
+    RUNTIME_PATH:                  "parachains/runtimes/testing"
+    RUNTIME_NAME:                  "penpal"
+
+build-runtime-testing-rococo-parachain:
+  <<: *build-runtime-template
+  variables:
+    RUNTIME_PATH:                  "parachains/runtimes/testing"
+    RUNTIME_NAME:                  "rococo-parachain"
+
 #### stage:                        publish
 
-.build-push-image:                  &build-push-image
+.build-push-image:                 &build-push-image
   image:                           quay.io/buildah/stable
   variables:
     DOCKERFILE:                    "" # docker/path-to.Dockerfile