ci: add linter

Author: m154k1

.github/workflows/lint.yml

@@ -0,0 +1,62 @@
+---
+name: Lint
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  shellcheck:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Check
+        run: shellcheck .env build-* fetch
+
+  yamllint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Check
+        run: yamllint --strict .
+
+  editorconfig:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install
+        uses: editorconfig-checker/action-editorconfig-checker@main
+
+      - name: Check
+        run: editorconfig-checker
+
+  actionlint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Check
+        uses: raven-actions/actionlint@v2
+
+  prettier:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node
+        uses: actions/setup-node@v4
+
+      - name: Install
+        run: npm install prettier@next
+
+      - name: Check
+        run: npx prettier --check .

.yamllint.yml

@@ -0,0 +1,5 @@
+---
+extends: default
+
+rules:
+  truthy: disable

README.md

@@ -1,6 +1,7 @@
 # mpv-build-macOS
 
 [![Build & Upload Artifact](https://github.com/m154k1/mpv-build-macOS/actions/workflows/build.yml/badge.svg)](https://github.com/m154k1/mpv-build-macOS/actions/workflows/build.yml)
+[![Lint](https://github.com/m154k1/mpv-build-macOS/actions/workflows/lint.yml/badge.svg)](https://github.com/m154k1/mpv-build-macOS/actions/workflows/lint.yml)
 
 A set of scripts that help build [mpv](https://mpv.io) on macOS.