Add Wildduck stack

.drone.yml

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+---
+kind: pipeline
+type: kubernetes
+name: default
+
+steps:
+- name: submodules
+  image: alpine/git
+  commands:
+  - git submodule update --init --recursive
+- name: wildduck
+  image: plugins/docker
+  settings:
+    context: wildduck/
+    dockerfile: wildduck/Dockerfile
+    repo: harbor.k-space.ee/k-space/wildduck
+    registry: harbor.k-space.ee
+    mtu: 1300
+    username:
+      from_secret: docker_username
+    password:
+      from_secret: docker_password
+- name: haraka
+  image: plugins/docker
+  settings:
+    context: haraka/
+    dockerfile: haraka/Dockerfile
+    repo: harbor.k-space.ee/k-space/haraka
+    registry: harbor.k-space.ee
+    mtu: 1300
+    username:
+      from_secret: docker_username
+    password:
+      from_secret: docker_password
+- name: zone-mta
+  image: plugins/docker
+  settings:
+    context: zone-mta/
+    dockerfile: zone-mta/Dockerfile
+    repo: harbor.k-space.ee/k-space/zone-mta
+    registry: harbor.k-space.ee
+    mtu: 1300
+    username:
+      from_secret: docker_username
+    password:
+      from_secret: docker_password

.gitmodules

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+[submodule "haraka"]
+	path = haraka
+	url = https://github.com/haraka/Haraka
+[submodule "zone-mta"]
+	path = zone-mta
+	url = https://github.com/zone-eu/zone-mta
+[submodule "wildduck"]
+	path = wildduck
+	url = https://github.com/nodemailer/wildduck