feat(slab): implement basic action operations

This consist in a simple "start" and "stop" mode for the action.

.eslintignore

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+lib/
+dist/
+node_modules/
+coverage/

.gitattributes

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+* text=auto eol=lf
+
+dist/** -diff linguist-generated=true

.github/codeql/codeql-config.yml

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+name: JavaScript CodeQL Configuration
+
+paths-ignore:
+  - node_modules
+  - dist

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+    groups:
+      actions-minor:
+        update-types:
+          - minor
+          - patch
+
+  - package-ecosystem: npm
+    directory: /
+    schedule:
+      interval: weekly
+    groups:
+      npm-development:
+        dependency-type: development
+        update-types:
+          - minor
+          - patch
+      npm-production:
+        dependency-type: production
+        update-types:
+          - patch

.github/linters/.eslintrc.yml

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+env:
+  commonjs: true
+  es6: true
+  jest: true
+  node: true
+
+globals:
+  Atomics: readonly
+  SharedArrayBuffer: readonly
+
+ignorePatterns:
+  - '!.*'
+  - '**/node_modules/.*'
+  - '**/dist/.*'
+  - '**/coverage/.*'
+  - '*.json'
+
+parser: '@babel/eslint-parser'
+
+parserOptions:
+  ecmaVersion: 2023
+  sourceType: module
+  requireConfigFile: false
+  babelOptions:
+    babelrc: false
+    configFile: false
+    presets:
+      - jest
+
+plugins:
+  - jest
+
+extends:
+  - eslint:recommended
+  - plugin:github/recommended
+  - plugin:jest/recommended
+
+rules:
+  {
+    'camelcase': 'off',
+    'eslint-comments/no-use': 'off',
+    'eslint-comments/no-unused-disable': 'off',
+    'i18n-text/no-en': 'off',
+    'import/no-commonjs': 'off',
+    'import/no-namespace': 'off',
+    'no-console': 'off',
+    'no-unused-vars': 'off',
+    'prettier/prettier': 'error',
+    'semi': 'off'
+  }

.github/linters/.markdown-lint.yml

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+# Unordered list style
+MD004:
+  style: dash
+
+# Ordered list item prefix
+MD029:
+  style: one

.github/linters/.yaml-lint.yml

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+rules:
+  document-end: disable
+  document-start:
+    level: warning
+    present: false
+  line-length:
+    level: warning
+    max: 80
+    allow-non-breakable-words: true
+    allow-non-breakable-inline-mappings: true

.github/workflows/check-dist.yml

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+# In JavaScript actions, `dist/` is a special directory. When you reference
+# an action with the `uses:` property, `dist/index.js` is the code that will be
+# run. For this project, the `dist/index.js` file is transpiled from other
+# source files. This workflow ensures the `dist/` directory contains the
+# expected transpiled code.
+#
+# If this workflow is run from a feature branch, it will act as an additional CI
+# check and fail if the checked-in `dist/` directory does not match what is
+# expected from the build.
+name: Check Transpiled JavaScript
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  check-dist:
+    name: Check dist/
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      statuses: write
+
+    steps:
+      - name: Checkout
+        id: checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        id: setup-node
+        uses: actions/setup-node@v4
+        with:
+          node-version-file: .node-version
+          cache: npm
+
+      - name: Install Dependencies
+        id: install
+        run: npm ci
+
+      - name: Build dist/ Directory
+        id: build
+        run: npm run bundle
+
+      # This will fail the workflow if the PR wasn't created by Dependabot.
+      - name: Compare Directories
+        id: diff
+        run: |
+          if [ "$(git diff --ignore-space-at-eol --text dist/ | wc -l)" -gt "0" ]; then
+            echo "Detected uncommitted changes after build. See status below:"
+            git diff --ignore-space-at-eol --text dist/
+            exit 1
+          fi
+
+      # If `dist/` was different than expected, and this was not a Dependabot
+      # PR, upload the expected version as a workflow artifact.
+      - if: ${{ failure() && steps.diff.outcome == 'failure' }}
+        name: Upload Artifact
+        id: upload
+        uses: actions/upload-artifact@v3
+        with:
+          name: dist
+          path: dist/

.github/workflows/ci.yml

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+name: Continuous Integration
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+
+jobs:
+  test-javascript:
+    name: JavaScript Tests
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        id: checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        id: setup-node
+        uses: actions/setup-node@v4
+        with:
+          node-version-file: .node-version
+          cache: npm
+
+      - name: Install Dependencies
+        id: npm-ci
+        run: npm ci
+
+      - name: Check Format
+        id: npm-format-check
+        run: npm run format:check
+
+      - name: Lint
+        id: npm-lint
+        run: npm run lint
+
+      - name: Test
+        id: npm-ci-test
+        run: npm run ci-test
+
+  test-action:
+    name: GitHub Actions Test
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        id: checkout
+        uses: actions/checkout@v4
+
+      - name: Test start instance
+        id: test-start
+        uses: ./
+        with:
+          mode: start
+          github-token: ${{ secrets.CONCRETE_ACTIONS_TOKEN }}
+          slab-url: ${{ secrets.SLAB_BASE_URL }}
+          job-secret: ${{ secrets.JOB_SECRET }}
+          region: eu-west-3
+          ec2-image-id: ami-01d21b7be69801c2f # Ubuntu 22.04
+          ec2-instance-type: t3.2xlarge
+
+      - name: Test stop instance
+        id: test-stop
+        uses: ./
+        with:
+          mode: stop
+          github-token: ${{ secrets.CONCRETE_ACTIONS_TOKEN }}
+          slab-url: ${{ secrets.SLAB_BASE_URL }}
+          job-secret: ${{ secrets.JOB_SECRET }}
+          region: eu-west-3
+          label: ${{ steps.test-start.outputs.label }}
+          ec2-instance-id: ${{ steps.test-start.outputs.ec2-instance-id }}

.github/workflows/linter.yml

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+name: Lint Codebase
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+  packages: read
+  statuses: write
+
+jobs:
+  lint:
+    name: Lint Codebase
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        id: checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        id: setup-node
+        uses: actions/setup-node@v4
+        with:
+          node-version-file: .node-version
+          cache: npm
+
+      - name: Install Dependencies
+        id: install
+        run: npm ci
+
+      - name: Lint Codebase
+        id: super-linter
+        uses: super-linter/super-linter/slim@v5
+        env:
+          DEFAULT_BRANCH: main
+          FILTER_REGEX_EXCLUDE: dist/**/*
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          JAVASCRIPT_DEFAULT_STYLE: prettier
+          VALIDATE_ALL_CODEBASE: true
+          VALIDATE_JSCPD: false
+          VALIDATE_MARKDOWN: false