Address linting warnings

.github/workflows/test.yaml

@@ -1,5 +1,9 @@
+---
 name: Test
+
+# yamllint disable-line rule:truthy
 on: [push, pull_request]
+
 jobs:
   build:
     name: Home Assistant Core Configuration Check

action.yaml

@@ -62,7 +62,8 @@ runs:
           secrets="${{ steps.check.outputs.path }}/${secrets}"
         elif [[ ! -f "${secrets}" ]];
         then
-          echo "::error ::Could not find specified secrets file: ${{ inputs.secrets }}"
+          echo "::error ::Could not find specified secrets file:"\
+            " ${{ inputs.secrets }}"
           exit 1
         fi