Enable CI on drone (#5)

.drone.yml

@@ -0,0 +1,5 @@
+pipeline:
+  build:
+    image: aegypius/repoman
+    commands:
+      - repoman -x -p

.gitlab-ci.yml

@@ -1,20 +0,0 @@
-stages:
-  - check
-  - deploy
-
-Repoman:
-  stage: check
-  script:
-    - repoman -x -p
-
-pages:
-  stage: deploy
-  only:
-    - master
-  script:
-    - chmod +x .gitlab-pages-generator.sh
-    - ./.gitlab-pages-generator.sh . .public
-    - mv .public public
-  artifacts:
-    paths:
-      - public

README.md

@@ -3,7 +3,7 @@ fritteli's Gentoo overlay
 
 Gentoo overlay with some ebuilds that I found either outdated or missing in the official repository or in other overlays. Ebuilds are usually removed from this overlay whenever I find a version available in the official tree or in another overlay (provided I'm satisfied with them).
 
-Build status of the [master branch](https://gittr.ch/linux/gentoo-overlay/src/branch/master), as seen by `repoman -p -x`: Currently unavailable.
+Build status of the [master branch](https://gittr.ch/linux/gentoo-overlay/src/branch/master), as seen by `repoman -p -x`: ![Build status](https://ci.gittr.ch/api/badges/linux/gentoo-overlay/status.svg)
 
 Using with plain (recent) Portage
 ---------------------------------