Added manifest definition

Author: tboerger

.drone.yml

@@ -85,6 +85,7 @@ pipeline:
     group: docker
     repo: plugins/matrix
     auto_tag: true
+    auto_tag_suffix: amd64
     dockerfile: Dockerfile
     when:
       event: [ push, tag ]
@@ -125,6 +126,16 @@ pipeline:
     when:
       event: [ push, tag ]
 
+  manifests:
+    image: plugins/manifest:1
+    pull: true
+    secrets: [ docker_username, docker_password ]
+    spec: manifest.tmpl
+    auto_tag: true
+    ignore_missing: true
+    when:
+      event: [ push, tag ]
+
   microbadger:
     image: plugins/webhook:1
     pull: true

manifest.tmpl

@@ -0,0 +1,33 @@
+image: plugins/matrix:{{#if build.tag}}{{trimPrefix build.tag "v"}}{{else}}latest{{/if}}
+{{#if build.tags}}
+tags:
+{{#each build.tags}}
+  - {{this}}
+{{/each}}
+{{/if}}
+manifests:
+  -
+    image: plugins/matrix:{{#if build.tag}}{{trimPrefix build.tag "v"}}-{{/if}}amd64
+    platform:
+      architecture: amd64
+      os: linux
+  -
+    image: plugins/matrix:{{#if build.tag}}{{trimPrefix build.tag "v"}}-{{/if}}i386
+    platform:
+      architecture: 386
+      os: linux
+  -
+    image: plugins/matrix:{{#if build.tag}}{{trimPrefix build.tag "v"}}-{{/if}}arm64
+    platform:
+      architecture: arm64
+      os: linux
+  -
+    image: plugins/matrix:{{#if build.tag}}{{trimPrefix build.tag "v"}}-{{/if}}arm
+    platform:
+      architecture: arm
+      os: linux
+  -
+    image: plugins/matrix:{{#if build.tag}}{{trimPrefix build.tag "v"}}-{{/if}}windows
+    platform:
+      architecture: amd64
+      os: windows