diff --git a/Dockerfile.dev b/dev.Dockerfile
similarity index 100%
rename from Dockerfile.dev
rename to dev.Dockerfile
diff --git a/dist/index.js b/dist/index.js
index 8450185..dc198f1 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -66,7 +66,7 @@ function getInputs() {
         tagSchedule: core.getInput('tag-schedule') || 'nightly',
         tagCustom: getInputList('tag-custom'),
         tagCustomOnly: /true/i.test(core.getInput('tag-custom-only') || 'false'),
-        labelCustom: getInputList('label-custom'),
+        labelCustom: getInputList('label-custom', true),
         sepTags: core.getInput('sep-tags') || `\n`,
         sepLabels: core.getInput('sep-labels') || `\n`,
         githubToken: core.getInput('github-token')
diff --git a/docker-bake.hcl b/docker-bake.hcl
index cf19424..4ea2460 100644
--- a/docker-bake.hcl
+++ b/docker-bake.hcl
@@ -11,7 +11,7 @@ group "validate" {
 }
 
 target "dockerfile" {
-  dockerfile = "Dockerfile.dev"
+  dockerfile = "dev.Dockerfile"
 }
 
 target "update-yarn" {
diff --git a/src/context.ts b/src/context.ts
index 3b55c16..acf8cac 100644
--- a/src/context.ts
+++ b/src/context.ts
@@ -44,7 +44,7 @@ export function getInputs(): Inputs {
     tagSchedule: core.getInput('tag-schedule') || 'nightly',
     tagCustom: getInputList('tag-custom'),
     tagCustomOnly: /true/i.test(core.getInput('tag-custom-only') || 'false'),
-    labelCustom: getInputList('label-custom'),
+    labelCustom: getInputList('label-custom', true),
     sepTags: core.getInput('sep-tags') || `\n`,
     sepLabels: core.getInput('sep-labels') || `\n`,
     githubToken: core.getInput('github-token')