Implement builder image

Add docker build to create a shared image for running CI pipelines and
docker builds based on debian.

.gitlab-ci.yml

@@ -0,0 +1,17 @@
+default:
+  image: docker:24.0.5
+
+build:
+  stage: build
+  script:
+    - docker build $CI_PROJECT_DIR
+      --tag ${REGISTRY_IMAGE}:${CI_COMMIT_REF_SLUG}
+      $(echo "$CI_COMMIT_TAG" | if grep -q $(date -u '+^r%g\.%-V\.\(0\|[1-9][0-9]*\)$');
+        then echo --tag ${REGISTRY_IMAGE}:latest;
+      fi)
+
+deploy:
+  stage: deploy
+  script:
+    - echo "$REGISTRY_PASSWORD" | docker login $CI_REGISTRY -u $REGISTRY_USER --password-stdin
+    - docker push --all-tags ${REGISTRY_IMAGE}