added gitlab ci

.gitlab-ci.yml

+---
+stages:
+  - create_ecr_repo
+  - build_and_push_image
+
+include:
+  - project: ebsi/technical-office/devops/gitlab-pipelines
+    ref: main
+    file: templates/docker-build.yaml
+
+variables:
+  IMAGE_NAME: ebsi/prometheus-puppetdb-exporter
+
+.rules_ref:
+  rules:
+    - if: $CI_COMMIT_TAG
+
+create_ecr_repo:
+  extends: .create_ecr_repo
+  rules:
+    - !reference [.rules_ref, rules]
+
+build_and_push_image:
+  extends: .build_and_push_image
+  rules:
+    - !reference [.rules_ref, rules]
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