Source cargo env. Don't add description if its gonna get cut off.

limbo/limbo-just-build.yaml

@@ -10,6 +10,7 @@ spec:
     script: |
       #!/usr/bin/env bash
       set -ex
+      source ~/.cargo/env
       cd $(workspaces.source.path)
       just ci/build
       just ci/test

limbo/limbo-pipeline.yaml

@@ -45,7 +45,7 @@ spec:
         - name: git-owner
           value: limbo
         - name: description
-          value: "Auto trigger build via tekton."
+          value: ""
         - name: git-repo-name
           value: $(params.gitea-repo-name)
         - name: name