gitlabci: switch to test rust-nightly till the stable image is update.

.gitlab-ci.yml

@@ -36,7 +36,7 @@ stages:
             - target/
             - .cargo_cache/
 
-rust:stable:
+.rust:stable:
     # https://hub.docker.com/_/rust/
     image: "rust"
     <<: *cargo_test
@@ -45,9 +45,9 @@ rust:nightly:
     # https://hub.docker.com/r/rustlang/rust/
     image: "rustlang/rust:nightly"
     <<: *cargo_test
-    only:
-        - schedule
-        - web
+    # only:
+    #     - schedule
+    #     - web
 
 flatpak:
     image: registry.gitlab.com/alatiera/gnome-nightly-oci/rust-bundle:latest