ci: check_format, check_commits, compile_jvm and test_jvm steps

.commitlintrc.yml

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+extends: "@commitlint/config-conventional"

.gitlab-ci.yml

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+stages:
+  - check
+  - compile
+  - test
+
+default:
+  image: gumjoe/wacc-ci-scala:slim
+
+check_format:
+  stage: check
+  before_script:
+    - cs install scalafmt
+  script:
+    - scalafmt --check . || echo "Run 'scala format' to fix formatting issues."
+
+check_commits:
+  stage: check
+  image: node:lts-alpine
+  before_script:
+    - apk add git
+    - npm install -g @commitlint/cli @commitlint/config-conventional
+    - git pull origin master
+  script:
+    - npx commitlint --from origin/master --to HEAD --verbose
+
+compile_jvm:
+  stage: compile
+  script:
+    - scala compile --platform jvm -Werror .
+  artifacts:
+    paths:
+      - .bsp/
+      - .scala-build/
+
+test_jvm:
+  stage: test
+  dependencies:
+    - compile_jvm
+  script:
+    - scala test --platform jvm .