feat: refactor .drone.yml

* syntax as per https://github.com/drone/drone/blob/master/.drone.yml
* fixed wrong yaml indentation that drone had to chew on...
* added 'type: docker' and 'os: linux' to every pipeline where relevant

.drone.yml

@@ -1,8 +1,10 @@
 ---
 kind: pipeline
+type: docker
 name: dockerhub-build-trigger
 
 platform:
+  os: linux
   arch: amd64
 
 clone:
@@ -20,16 +22,17 @@ steps:
   - curl -sO https://git.dotya.ml/wanderer/docker-fedora-hugo/raw/branch/master/curl.it
   - bash ./curl.it $ENDPOINT
 
-
 ---
 kind: pipeline
+type: docker
 name: kaniko-build
 
 platform:
+  os: linux
   arch: amd64
 
 depends_on:
-  - dockerhub-build-trigger
+- dockerhub-build-trigger
 
 steps:
 - name: build
@@ -39,9 +42,9 @@ steps:
     dockerfile: Dockerfile
     context: .
 
-
 ---
 kind: pipeline
+type: docker
 name: notifications
 
 platform:
@@ -51,21 +54,8 @@ platform:
 clone:
   disable: true
 
-trigger:
-  branch:
-    - master
-  event:
-    - push
-    - tag
-  status:
-    - success
-    - failure
-
-depends_on:
-  - kaniko-build
-
 steps:
-  - name: discord
+- name: discord
   pull: if-not-exists
   image: appleboy/drone-discord:latest
   settings:
@@ -85,8 +75,22 @@ steps:
     webhook_token:
       from_secret: discord_webhook_token
 
+trigger:
+  branch:
+  - master
+  event:
+  - push
+  - tag
+  status:
+  - success
+  - failure
+
+depends_on:
+- kaniko-build
+
 ---
 kind: pipeline
+type: docker
 name: notifications-cronbuild
 
 platform:
@@ -96,22 +100,8 @@ platform:
 clone:
   disable: true
 
-trigger:
-  branch:
-    - master
-  event:
-    - cron
-  cron:
-    - nightly
-  status:
-    - success
-    - failure
-
-depends_on:
-  - kaniko-build
-
 steps:
-  - name: discord
+- name: discord
   pull: always
   image: appleboy/drone-discord:latest
   settings:
@@ -129,3 +119,17 @@ steps:
       from_secret: discord_webhook_hourly_id
     webhook_token:
       from_secret: discord_webhook_hourly_token
+
+trigger:
+  branch:
+  - master
+  event:
+  - cron
+  cron:
+  - nightly
+  status:
+  - success
+  - failure
+
+depends_on:
+- kaniko-build