Fixup #71 (#75)

handle_caches.jl

@@ -9,6 +9,7 @@ function handle_caches()
         run(`gh cache list --limit 100 --repo $repo`)
     elseif func == "rm"
         caches = String[]
+        failed = String[]
         for _ in 1:5 # limit to avoid accidental rate limiting
             hits = split(strip(read(`gh cache list --limit 100 --repo $repo`, String)), keepempty=false)
             search_again = length(hits) == 100
@@ -18,18 +19,37 @@ function handle_caches()
             for c in hits
                 try
                     run(`gh cache delete $(split(c)[1]) --repo $repo`)
+                    push!(caches, c)
                 catch e
                     @error e
+                    push!(failed, c)
                 end
             end
-            append!(caches, hits)
             search_again || break
         end
-        if isempty(caches)
+        if isempty(failed) && isempty(caches)
             println("No existing caches found for restore key `$restore_key`")
         else
-            println("$(length(caches)) existing caches deleted that match restore key `$restore_key`:")
-            println.(caches)
+            if !isempty(failed)
+                println("Failed to delete $(length(failed)) existing caches for restore key `$restore_key`")
+                println.(failed)
+                @info """
+                    To delete caches you need to grant the following to the default `GITHUB_TOKEN` by adding
+                    this to your yml:
+                    ```
+                    permissions:
+                        actions: write
+                        contents: read
+                    ```
+                    (Note this won't work for fork PRs but should once merged)
+                    Or provide a token with `repo` scope via the `token` input option.
+                    See https://cli.github.com/manual/gh_cache_delete
+                    """
+            end
+            if !isempty(caches)
+                println("$(length(caches)) existing caches deleted that match restore key `$restore_key`:")
+                println.(caches)
+            end
         end
     else
         throw(ArgumentError("Unexpected second argument: $func"))