Have a super_ref in workflow_dispatch

Author: philrz

.github/workflows/ci.yaml

@@ -2,6 +2,11 @@ name: Tests
 
 on:
   workflow_dispatch:
+    inputs:
+      super_ref:
+        description: 'brimdata/super branch, tag, or SHA to test against'
+        default: main
+        required: false
   repository_dispatch:
     types: [super-push]
   schedule:
@@ -18,6 +23,7 @@ jobs:
       - uses: actions/checkout@v4
         with:
           repository: brimdata/super
+          ref: ${{ inputs.super_ref || 'main' }}
           path: super
       - uses: actions/setup-go@v5
         with:
@@ -46,6 +52,7 @@ jobs:
       - uses: actions/checkout@v4
         with:
           repository: brimdata/super
+          ref: ${{ inputs.super_ref || 'main' }}
           path: super
       - uses: actions/setup-go@v5
         with: