Add basic CI/CD functionality

This MR adds a basic CD/CD pipeline, which validates the top-level pipeline.cwl workflow with an example input.

.gitlab-ci.yml

@@ -20,19 +20,8 @@ build-image:
   before_script: 
     - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
   script:
-    - |
-      if docker pull $CI_REGISTRY_IMAGE/ci-build-runner:$CI_COMMIT_REF_SLUG; then
-        docker build --cache-from $CI_REGISTRY_IMAGE/ci-build-runner:$CI_COMMIT_REF_SLUG --tag $CI_REGISTRY_IMAGE/ci-build-runner:$CI_COMMIT_REF_SLUG docker/ci-runner
-      else
-        docker pull $CI_REGISTRY_IMAGE/ci-build-runner:latest || true
-        docker build --cache-from $CI_REGISTRY_IMAGE/ci-build-runner:latest --tag $CI_REGISTRY_IMAGE/ci-build-runner:$CI_COMMIT_REF_SLUG docker/ci-runner
-      fi
+    - docker build docker/ci-runner --tag $CI_REGISTRY_IMAGE/ci-build-runner:$CI_COMMIT_REF_SLUG
     - docker push $CI_REGISTRY_IMAGE/ci-build-runner:$CI_COMMIT_REF_SLUG  # push the image
-    - |
-      if [[ "$CI_COMMIT_BRANCH" == "$CI_DEFAULT_BRANCH" ]]; then
-        docker image tag $CI_REGISTRY_IMAGE/ci-build-runner:$CI_COMMIT_REF_SLUG $CI_REGISTRY_IMAGE/ci-build-runner:latest
-        docker push $CI_REGISTRY_IMAGE/ci-build-runner:latest
-      fi
 
 sast:
   variables: