composed envsets

.drone-home.jsonnet

@@ -118,6 +118,11 @@ local images = {
       port: util.fromSecret("ssh-port"),
       username: util.fromSecret("ssh-user"),
       password: util.fromSecret("ssh-password"),
+      envs: [
+        'drone_tag',
+        'drone_commit',
+        'drone_build_number',
+      ],
       script: [],
     },
   },
@@ -194,6 +199,7 @@ local images = {
             function(s) function(step) step {
               settings +: {
                 script +: [
+                  "export D=$${DRONE_COMMIT}",
                   "export %(env)s='${%(env)s}'" % {
                     env: util.environment(s),
                   },