Add CI quality gates

.github/workflows/ci.yml

@@ -0,0 +1,36 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+# a UTF-8 locale with real collation tables: on macOS this is what makes
+# awk's == collapse all Cyrillic letters (the trap mirror.awk works around);
+# runners default to C/C.UTF-8 where that behavior would not reproduce
+env:
+  LC_ALL: en_US.UTF-8
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: make lint
+
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install tmux
+        run: |
+          if [ "$RUNNER_OS" = "macOS" ]; then
+            brew install tmux
+          else
+            sudo apt-get update && sudo apt-get install -y tmux
+          fi
+      - run: make test

README.md

@@ -1,5 +1,7 @@
 # tmux-langmap
 
+[![CI](https://github.com/lukashes/tmux-langmap/actions/workflows/ci.yml/badge.svg)](https://github.com/lukashes/tmux-langmap/actions/workflows/ci.yml)
+
 Makes tmux bindings work from a Cyrillic keyboard layout, like Vim's
 `langmap` option does for Vim. At load the plugin reads your current
 bindings and duplicates each one onto the character the same physical key