wip nightly cronjob CI

Author: Manishearth

.github/workflows/build-test.yml

@@ -19,12 +19,19 @@ on:
   pull_request:
     branches: '*'
 
+
 jobs:
 
   # Build job - basic smoke test
   check:
     runs-on: ubuntu-latest
     steps:
+    - name: Set the rust toolchain to use
+    # pull_request is a fake for me to be able to test this for now
+    - if: github.event.schedule || github.event.pull_request || (github.event.workflow_dispatch && inputs.nightly)
+      run: |
+        rustup default nightly
+        echo "ICU4X_NIGHTLY_TOOLCHAIN=nightly" >> >> $GITHUB_ENV
     - uses: actions/checkout@v2
     - name: Load the default Rust toolchain via the rust-toolchain file.
       run: rustup show