Add CI build control

+stages:
+ - build
+ - test
+ - deploy
+
+before_script:
+  - layman -S
+  - emerge --update emerge --ask=n -G n -K n libtrbase
+  - ./bootstrap
+  - ./configure
+
+build:
+ stage: build
+ script:
+  - make
+
+test:
+ stage: test
+ script:
+  - make test
+
+dist:
+ stage: deploy
+ only:
+  - tags
+ script:
+  - make dist
+  - ssh ci_upload@192.168.20.60 install -d trio/artifacts
+  - scp libtrio-*.tar.gz ci_upload@192.168.20.60:~/trio/artifacts