Merge branch 'impish' into 'master'

Add Ubuntu impish

See merge request !19

.gitlab-ci.yml

@@ -196,6 +196,32 @@ upload/debian/stretch:
 # Ubuntu
 ###################################
 
+# impish
+ubuntu/impish:
+  <<: *source
+  variables:
+    DOCKER_IMAGE: ubuntu/impish
+
+ubuntu/impish:x86_64:
+  <<: *binary
+  variables:
+    DOCKER_IMAGE: ubuntu/impish
+  dependencies:
+    - ubuntu/impish
+
+test/ubuntu/impish:x86_64:
+  <<: *test
+  variables:
+    DOCKER_IMAGE: ubuntu/impish
+  dependencies:
+    - ubuntu/impish
+
+upload/ubuntu/impish:
+  <<: *upload
+  dependencies:
+    - ubuntu/impish:x86_64
+    - ubuntu/impish
+
 # hirsute
 ubuntu/hirsute:
   <<: *source