ci: switch to drone-matrix plugin

.drone.yml

@@ -175,7 +175,7 @@ steps:
         - success
 
   - name: matrix
-  image: plugins/matrix
+    image: thegeeklab/drone-matrix
     settings:
       homeserver:
         from_secret: matrix_homeserver
@@ -183,7 +183,7 @@ steps:
         from_secret: matrix_password
       roomid:
         from_secret: matrix_roomid
-    template: "Status: **{{ build.status }}**<br/> Build: [{{ repo.Owner }}/{{ repo.Name }}]({{ build.link }}) ({{ build.branch }}) by {{ build.author }}<br/> Message: {{ build.message }}"
+      template: "Status: **{{ build.Status }}**<br/> Build: [{{ repo.Owner }}/{{ repo.Name }}]({{ build.Link }}) ({{ build.Branch }}) by {{ commit.Author }}<br/> Message: {{ commit.Message }}"
       username:
         from_secret: matrix_username
     when:
@@ -204,6 +204,6 @@ depends_on:
 
 ---
 kind: signature
-hmac: b03e655c89137813302453a422df07b0d905cbd6cdfe9d0719cf45e167f7ea75
+hmac: 8dc112db323d4825edbc52cf2c743ccf00c07be47cabe7a6faa21b58b678a782
 
 ...