Add workflow to lint workflows

.github/workflows/workflows-ci.yaml

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+---
+name: Workflows CI
+
+# yamllint disable-line rule:truthy
+on:
+  push:
+  pull_request:
+    types:
+      - opened
+      - reopened
+      - synchronize
+  workflow_dispatch:
+
+jobs:
+  lint-markdown:
+    name: MarkdownLint
+    runs-on: ubuntu-latest
+    steps:
+      - name: ⤵️ Check out code from GitHub
+        uses: actions/checkout@v2.3.5
+      - name: 🚀 Run mdl
+        uses: actionshub/markdownlint@2.0.2
+
+  lint-shellcheck:
+    name: Shellcheck
+    runs-on: ubuntu-latest
+    steps:
+      - name: ⤵️ Check out code from GitHub
+        uses: actions/checkout@v2.3.5
+      - name: 🚀 Run Shellcheck
+        uses: ludeeus/action-shellcheck@1.1.0
+        env:
+          SHELLCHECK_OPTS: -s bash
+
+  lint-yamllint:
+    name: YAMLLint
+    runs-on: ubuntu-latest
+    steps:
+      - name: ⤵️ Check out code from GitHub
+        uses: actions/checkout@v2.3.5
+      - name: 🚀 Run YAMLLint
+        uses: frenck/action-yamllint@v1.1
+
+  lint-prettier:
+    name: Prettier
+    runs-on: ubuntu-latest
+    steps:
+      - name: ⤵️ Check out code from GitHub
+        uses: actions/checkout@v2.3.5
+      - name: 🚀 Run Prettier
+        uses: creyD/prettier_action@v4.0
+        with:
+          prettier_options: --write **/*.{json,js,md,yaml}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.mdlrc

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+rules "~MD024"

.yamllint

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+---
+rules:
+  braces:
+    level: error
+    min-spaces-inside: 0
+    max-spaces-inside: 1
+    min-spaces-inside-empty: -1
+    max-spaces-inside-empty: -1
+  brackets:
+    level: error
+    min-spaces-inside: 0
+    max-spaces-inside: 0
+    min-spaces-inside-empty: -1
+    max-spaces-inside-empty: -1
+  colons:
+    level: error
+    max-spaces-before: 0
+    max-spaces-after: 1
+  commas:
+    level: error
+    max-spaces-before: 0
+    min-spaces-after: 1
+    max-spaces-after: 1
+  comments:
+    level: error
+    require-starting-space: true
+    min-spaces-from-content: 2
+  comments-indentation:
+    level: error
+  document-end:
+    level: error
+    present: false
+  document-start:
+    level: error
+    present: true
+  empty-lines:
+    level: error
+    max: 1
+    max-start: 0
+    max-end: 1
+  hyphens:
+    level: error
+    max-spaces-after: 1
+  indentation:
+    level: error
+    spaces: 2
+    indent-sequences: true
+    check-multi-line-strings: false
+  key-duplicates:
+    level: error
+  line-length:
+    level: warning
+    max: 120
+    allow-non-breakable-words: true
+    allow-non-breakable-inline-mappings: true
+  new-line-at-end-of-file:
+    level: error
+  new-lines:
+    level: error
+    type: unix
+  trailing-spaces:
+    level: error
+  truthy:
+    level: error