add drone pipeline

.drone.yml

@@ -0,0 +1,18 @@
+kind: pipeline
+name: build image
+
+steps:
+- name: publish
+  image: plugins/docker
+  settings:
+    registry: codeberg.org
+    username:
+      from_secret: registry_username
+    password:
+      from_secret: registry_password
+    repo: codeberg.org/angestoepselt/homepage
+    build_args:
+    - SITE=angestoepselt
+    tags: latest
+    when:
+      branch: [captcha]