standard-tests.yaml: Rename to ci.yaml

In another attempt at making CI workflow naming more concise:

  - Rename standard-tests.yaml to ci.yaml

    Currently the contents of this file covers everything CI-related
    that happens in the context workflows, so for the time being,
    naming it ci.yaml is just fitting. And it's going to be shorter
    in commit message summaries. Should a real need arise, we can
    always split the file up again.

  - Shorten names again, otherwise they don't fit into Forgejo's
    check-mark-popup. That should be self-explanatory in context:

    name:
      Default CI -> CI

    jobs.CI.name:
      Packaging test - All supported platforms -> Packaging test

Signed-off-by: Jan Lindemann <jan@janware.com>

.github/workflows/ci.yaml

@@ -1,4 +1,4 @@
-name: Standard CI tests
+name: CI
 on:
   pull_request:
     types: [opened, synchronize, reopened]
@@ -9,5 +9,5 @@ on:
       - released
 jobs:
   CI:
-    name: Packaging test - All supported platforms
-    uses: ci/workflows/.github/workflows/test-packaging.yaml@master
+    name: Packaging test
+    uses: ci/workflows/.github/workflows/test-packaging.yaml@master-test