Add build_type input field for test.yaml (#766)

Exposes `build_type` as an input in `test.yaml` so that `test.yaml` can be
manually run against a specific branch/commit as needed.

The default value is still `nightly`, and without maintainer intervention, that
is what will run each night.

xref rapidsai/build-planning#147

Authors:
  - Gil Forsyth (https://github.com/gforsyth)

Approvers:
  - James Lamb (https://github.com/jameslamb)

URL: #766

.github/workflows/test.yaml

@@ -12,13 +12,16 @@ on:
       sha:
         required: true
         type: string
+      build_type:
+        type: string
+        default: nightly
 
 jobs:
   cpp-tests:
     secrets: inherit
     uses: rapidsai/shared-workflows/.github/workflows/conda-cpp-tests.yaml@nvks-runners
     with:
-      build_type: nightly
+      build_type: ${{ inputs.build_type }}
       branch: ${{ inputs.branch }}
       date: ${{ inputs.date }}
       sha: ${{ inputs.sha }}