Enable CI

.gitlab-ci.yml

+.go_stuff: &go_stuff
+  image: golang:latest
+  before_script:
+    - go version
+    - export PKG_ROOT="${GOPATH}/src/git.scc.kit.edu/KIT-CA/"
+    - export PKG_PATH="${PKG_ROOT}/dfnpkitool"
+    - echo "${CI_PROJECT_DIR}" "${PKG_PATH}"
+    - mkdir -p "${PKG_ROOT}"
+    - ln -s "${CI_PROJECT_DIR}" "${PKG_PATH}"
+    - cd "${PKG_PATH}"
+	- unset GOPATH
+
+build:
+  <<: *go_stuff
+  script:
+    - go get -v -t ./...
+    - go build
+  artifacts:
+    expire_in: 1 year
+    paths:
+      - dfnpkitool