Remove unnecessary docker-in-docker

We're now launching new build servers, so security is less of a concern.

Signed-off-by: Jacob Kiers <jacob@jacobkiers.net>

.drone.jsonnet

@@ -19,7 +19,7 @@ local add_build_steps() = [
     volumes: [
       {
         name: 'dockersock',
-        path: '/var/run',
+        path: '/var/run/docker.sock',
       },
     ],
     commands: [
@@ -29,7 +29,7 @@ local add_build_steps() = [
       'rm -rf target/' + arch.target + '/release/*',
     ],
     environment: {
-      CROSS_REMOTE: true,
+      CROSS_DOCKER_IN_DOCKER: true,
     },
     depends_on: ['Wait for Docker'],
   }
@@ -57,11 +57,11 @@ local add_build_steps() = [
         'docker pull hello-world:latest',
       ],
       environment: {
-        CROSS_REMOTE: true,
+        CROSS_DOCKER_IN_DOCKER: true,
       },
       volumes: [{
         name: 'dockersock',
-        path: '/var/run',
+        path: '/var/run/docker.sock',
       }],
     }] +
     add_build_steps() +
@@ -92,26 +92,12 @@ local add_build_steps() = [
       },
     ],
 
-  services: [{
-    name: 'docker',
-    image: 'docker:dind',
-    privileged: true,
-    volumes: [
-      {
-        name: 'dockersock',
-        path: '/var/run',
-      },
-      {
-        name: 'docker-storage',
-        path: '/var/lib/docker',
-      },
-    ],
-  }],
-
   volumes: [
     {
       name: 'dockersock',
-      temp: {},
+      host: {
+        path: '/var/run/docker.sock',
+      },
     },
   ],