added CI/CD

.gitlab-ci.yml

+image: openjdk:8-jdk
+
+develop:
+  script:
+    - curl -L -o saref-pipeline.jar "https://gitlab.emse.fr/saref/saref-pipeline/-/jobs/artifacts/master/raw/target/saref-pipeline.jar?job=build"
+    - java -jar saref-pipeline.jar develop -s
+  except:
+    - /^prerelease-v/
+    - /^release-v/
+  artifacts:
+    when: always
+    paths:
+      - target/site
+      - target/report_output.xml
+    reports:
+      junit: target/report_output.xml
+
+release:
+  script:
+    - curl -L -o saref-pipeline.jar "https://gitlab.emse.fr/saref/saref-pipeline/-/jobs/artifacts/master/raw/target/saref-pipeline.jar?job=build"
+    - java -jar saref-pipeline.jar release -s
+  only: 
+    - /^prerelease-v/
+    - /^release-v/
+  artifacts:
+    when: always
+    paths:
+      - target/site
+      - target/report_output.xml
+    reports:
+      junit: target/report_output.xml