Adding io gitlab-ci

.gitlab-ci.yml

+centos_build:
+  stage: build
+  tags:
+    - centos
+  artifacts:
+    paths:
+      - ./openfpm_io/build/src/io
+  script:
+    - ./build.sh $CI_PROJECT_DIR $CI_RUNNER_TAGS NO $CI_COMMIT_REF_NAME
+
+centos_run:
+  stage: test
+  tags:
+    - centos
+  dependencies:
+    - centos_build
+  script:
+    - ./openfpm_io/build/src/io
+
+mac_build:
+  stage: build
+  tags:
+    - mac
+  artifacts:
+    paths:
+      - ./openfpm_io/build/src/io
+  script:
+    - ./build.sh $CI_PROJECT_DIR $CI_RUNNER_TAGS NO $CI_COMMIT_REF_NAME
+
+mac_run:
+  stage: test
+  tags:
+    - mac
+  dependencies:
+    - mac_build
+  script:
+    - ./openfpm_io/build/src/io
+
+ubuntu_build:
+  stage: build
+  tags:
+    - ubuntu
+  artifacts:
+    paths:
+      - ./openfpm_io/build/src/io
+  script:
+    - ./build.sh $CI_PROJECT_DIR $CI_RUNNER_EXECUTABLE_TAGS NO $CI_COMMIT_REF_NAME
+
+ubuntu_run:
+  stage: test
+  tags:
+    - ubuntu
+  dependencies:
+    - ubuntu_build
+  script:
+    - ./openfpm_io/build/src/io
+