Resolve "Improve CI template organization"

Closes #35 (closed)

.gitlab-industrial-ci.yml

+variables:
+  DEFAULT_DISTRO: "kinetic"
+
+workflow:
+  rules:
+    - if:
+    - if: $CI_COMMIT_BRANCH && $CI_COMMIT_REF_NAME =~ /^melodic-.*/
+      variables:
+        DEFAULT_DISTRO: "melodic"
+    - if: $CI_COMMIT_BRANCH && $CI_COMMIT_REF_NAME =~ /^noetic-.*/
+      variables:
+        DEFAULT_DISTRO: "noetic"
+    - if: $CI_COMMIT_BRANCH && $CI_COMMIT_REF_NAME =~ /^kinetic-.*/
+      variables:
+        DEFAULT_DISTRO: "kinetic"
+    - exists:
+      - .rosinstall
+
+export:
+    script: export
+
+noetic:
+    script: echo noetic
+    rules:
+      - if: '$DEFAULT_DISTRO == "noetic"'
+      - if: $BUILD_NOETIC
+
+melodic:
+    script: echo melodic
+    rules:
+      - if: '$DEFAULT_DISTRO == "melodic"'
+      - if: $BUILD_MELODIC
+
+kinetic:
+    script: echo kinetic
+    rules:
+      - if: '$DEFAULT_DISTRO == "kinetic"'
+      - if: $BUILD_KINETIC
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