in input-helper, make ref fallback to commit if the commit was provid…

…ed but not ref

Signed-off-by: James Bradlee <james.bradlee@telenor.no>

src/input-helper.ts

@@ -58,7 +58,7 @@ export async function getInputs(): Promise<IGitSourceSettings> {
 
   // Source branch, source version
   result.commit = core.getInput('commit')
-  result.ref = core.getInput('ref')
+  result.ref = core.getInput('ref') ?? result.commit
   if (!result.ref) {
     if (isWorkflowRepository) {
       result.ref = github.context.ref