Add ssh-keys core plugin

tests/unit/30_ssh_keys.bats

@@ -0,0 +1,38 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+setup() {
+  create_key
+}
+
+teardown() {
+  destroy_key
+}
+
+@test "(ssh-keys) ssh-keys:add, ssh-keys:list, ssh-keys:remove" {
+  run /bin/bash -c "dokku ssh-keys:add name1 /tmp/testkey.pub"
+  echo "output: "$output
+  echo "status: "$status
+  assert_success
+  run /bin/bash -c "cat /tmp/testkey.pub | dokku ssh-keys:add name2"
+  echo "output: "$output
+  echo "status: "$status
+  assert_success
+  run /bin/bash -c "dokku ssh-keys:list | grep name1 && dokku ssh-keys:list | grep name2"
+  echo "output: "$output
+  echo "status: "$status
+  assert_success
+  run /bin/bash -c "dokku ssh-keys:remove name1"
+  echo "output: "$output
+  echo "status: "$status
+  assert_success
+  run /bin/bash -c "dokku ssh-keys:list | grep name1"
+  echo "output: "$output
+  echo "status: "$status
+  assert_failure
+  run /bin/bash -c "dokku ssh-keys:list | grep name2"
+  echo "output: "$output
+  echo "status: "$status
+  assert_success
+}