fix: remove incorrect digest pinning from image reference

Reviewed-on: #150

.gitlab-ci.yml

@@ -1,35 +0,0 @@
-include:
-- template: 'Workflows/MergeRequest-Pipelines.gitlab-ci.yml'
-- project: unboundsoftware/ci-templates
-  file: Defaults.gitlab-ci.yml
-
-stages:
-  - build
-  - deploy-prod
-
-image: buildtool/build-tools:${BUILDTOOLS_VERSION}
-
-build:
-  stage: build
-  script:
-    - build
-    - curl -Os https://uploader.codecov.io/latest/linux/codecov
-    - chmod +x codecov
-    - ./codecov -t ${CODECOV_TOKEN} -R $CI_PROJECT_DIR -C $CI_COMMIT_SHA -r $CI_PROJECT_PATH
-    - push
-  artifacts:
-    paths:
-      - release/
-      - coverage.html
-      - k8s
-
-deploy-prod:
-  stage: deploy-prod
-  before_script:
-    - echo Deploy to prod
-  script:
-    - deploy prod
-  only:
-    - master
-  environment:
-    name: prod