Remove unnecessary quotes from YAML code/examples, standardize on sin…

…gle (vs. double) quotes, add test for invalid configuration file.

.github/workflows/test.yml

@@ -20,14 +20,22 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - uses: ./
-  one-glob:
+  one-glob-file:
     name: One glob (test/errors.md, 3 errors)
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
     - uses: ./
       with:
         globs: test/errors.md
+  one-glob-pattern:
+    name: One glob (*.md, 3 errors)
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: ./
+      with:
+        globs: '*.md'
   two-globs:
     name: Two globs (README.md and test/errors.md, 3 errors)
     runs-on: ubuntu-latest
@@ -49,6 +57,17 @@ jobs:
         globs: |
           config/test.markdownlint.jsonc
           test/*
+  command-config-invalid:
+    name: Command = config (invalid, fails)
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: ./
+      with:
+        command: config
+        globs: |
+          invalid.markdownlint.jsonc
+          test/*
   command-config-missing:
     name: Command = config (missing configuration file, fails)
     runs-on: ubuntu-latest

README.md

@@ -53,7 +53,7 @@ To lint all Markdown files in a project:
 ```yaml
 - uses: DavidAnson/markdownlint-cli2-action@v5
   with:
-    globs: "**/*.md"
+    globs: '**/*.md'
 ```
 
 To lint specific Markdown files in a project:

action.yml

@@ -1,18 +1,18 @@
-name: 'markdownlint-cli2-action'
-author: 'David Anson'
-description: 'A GitHub Action to run the markdownlint-cli2 tool for linting Markdown/CommonMark files with the markdownlint library'
+name: markdownlint-cli2-action
+author: David Anson
+description: A GitHub Action to run the markdownlint-cli2 tool for linting Markdown/CommonMark files with the markdownlint library
 branding:
-  icon: 'check-square'
-  color: 'orange'
+  icon: check-square
+  color: orange
 inputs:
   command:
-    description: 'Command to run (unset, "fix", or "config")'
+    description: Command to run (unset, "fix", or "config")
     default: ''
     required: false
   globs:
-    description: 'Glob expression(s) of files to lint (newline-delimited)'
+    description: Glob expression(s) of files to lint (newline-delimited)
     default: '*.{md,markdown}'
     required: false
 runs:
-  using: 'node16'
-  main: 'dist/index.js'
+  using: node16
+  main: dist/index.js