add drone

.drone.yml

@@ -0,0 +1,36 @@
+kind: pipeline
+name: default
+
+steps:
+  - name: docker-postfix
+    image: plugins/docker
+    settings:
+      registry: r.sbruder.de
+      username:
+        from_secret: docker_username
+      password:
+        from_secret: docker_password
+      context: postfix
+      repo: r.sbruder.de/postfix
+
+  - name: docker-postgrey
+    image: plugins/docker
+    settings:
+      registry: r.sbruder.de
+      username:
+        from_secret: docker_username
+      password:
+        from_secret: docker_password
+      context: postgrey
+      repo: r.sbruder.de/postgrey
+
+  - name: docker-dovecot
+    image: plugins/docker
+    settings:
+      registry: r.sbruder.de
+      username:
+        from_secret: docker_username
+      password:
+        from_secret: docker_password
+      context: dovecot
+      repo: r.sbruder.de/dovecot

docker-compose.yml.example

@@ -2,6 +2,7 @@ version: "3"
 services:
   postfix:
     build: postfix
+    image: r.sbruder.de/postfix
     restart: always
     environment:
       - MYHOSTNAME=mail.example.com
@@ -28,12 +29,14 @@ services:
 
   postgrey:
     build: postgrey
+    image: r.sbruder.de/postgrey
     restart: always
     volumes:
       - ./spool/postgrey:/var/spool/postfix/postgrey
 
   dovecot:
     build: dovecot
+    image: r.sbruder.de/dovecot
     restart: always
     environment:
       - LDAP_SERVER=ldap.example.com