switch to custom drone docker plugin

.drone.yml

@@ -28,7 +28,7 @@ platform:
 
 steps:
 - name: dryrun
-  image: plugins/docker:19
+  image: thegeeklab/drone-docker:19
   settings:
     dockerfile: Dockerfile
     dry_run: true
@@ -56,7 +56,7 @@ steps:
   - dryrun
 
 - name: publish-dockerhub
-  image: plugins/docker:19
+  image: thegeeklab/drone-docker:19
   settings:
     dockerfile: Dockerfile
     password:
@@ -72,7 +72,7 @@ steps:
   - tags
 
 - name: publish-quay
-  image: plugins/docker:19
+  image: thegeeklab/drone-docker:19
   settings:
     dockerfile: Dockerfile
     password:
@@ -179,6 +179,6 @@ depends_on:
 
 ---
 kind: signature
-hmac: e4518ae0822f4377a1a0a134be40312afdfa596b1062a6f20843a6d3c74a01c0
+hmac: 98caeb64f7ee52e08b3ad35b4c496b68bcb3e276aac6f08fee75db2e9657aa82
 
 ...