fix error for deleting all pre-release versions

src/delete.ts

@@ -20,7 +20,10 @@ export function getVersionIds(input: Input): Observable<string[]> {
         const numberVersionsToDelete =
           versionInfo.length - input.minVersionsToKeep
 
-        if (input.deletePreReleaseVersions == 'true') {
+        if (
+          input.deletePreReleaseVersions == 'true' &&
+          input.minVersionsToKeep > 0
+        ) {
           return numberVersionsToDelete <= 0
             ? []
             : versionInfo

src/input.ts

@@ -47,8 +47,6 @@ export class Input {
     this.token = validatedParams.token
 
     if (this.deletePreReleaseVersions == 'true') {
-      this.minVersionsToKeep =
-        this.minVersionsToKeep > 0 ? this.minVersionsToKeep : 1
       this.numOldVersionsToDelete = 100 - this.minVersionsToKeep
       this.ignoreVersions = new RegExp('^(0|[1-9]\\d*)((\\.(0|[1-9]\\d*))*)$')
     }