ci: add makefile and github workflows

.github/workflows/format.yml

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+name: format
+
+on: [push, pull_request]
+
+jobs:
+  lint:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+      - uses: JohnnyMorganz/stylua-action@v3
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          version: 0.17.1
+          args: --check .

.github/workflows/lint.yml

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+name: lint
+
+on: [push, pull_request]
+
+jobs:
+  lint:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+      - name: install luacheck
+        run: |
+          sudo apt-get update
+          sudo apt-get install lua-check
+      - name: lint
+        run: make lint

.github/workflows/luarocks.yml

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+name: push-to-luarocks
+
+on:
+  push:
+    tags:
+      - '*'
+  release: 
+    types:
+      - created # Triggered by release-please
+  pull_request: # Tests a local luarocks install without publishing on PRs
+  workflow_dispatch: # Allow manual trigger
+
+jobs:
+  luarocks-upload:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0 # Required to count the commits
+      - name: get version
+        # Tags created by GitHub releases don't trigger push: tags workflows
+        # So we have to determine the tag manually.
+        run: echo "LUAROCKS_VERSION=$(git describe --abbrev=0 --tags)" >> $GITHUB_ENV
+      - name: luarocks upload
+        uses: nvim-neorocks/luarocks-tag-release@v5
+        env:
+          LUAROCKS_API_KEY: ${{ secrets.LUAROCKS_API_KEY }}
+        with:
+          version: ${{ env.LUAROCKS_VERSION }}
+          detailed_description: |
+            `deadcolumn.nvim` assists you to maintain a specific column width
+            in your code by gradually displaying the colorcolumn as you
+            approaches it.

.github/workflows/release-please.yml

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+name: release-please
+
+on:
+  push:
+    branches:
+      - master
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  release-please:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: google-github-actions/release-please-action@v3
+        with:
+          release-type: simple
+          package-name: deadcolumn.nvim

.luacheckrc

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+globals = { 'vim' }
+max_line_length = false

Makefile

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+.PHONY: all
+all: format-check lint
+
+.PHONY: format-check
+format-check:
+	stylua . --check
+
+.PHONY: format
+format:
+	stylua .
+
+.PHONY: lint
+lint:
+	luacheck .