ci: add necessary GitHub workflows

.github/labels.yml

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+---
+- name: "breaking-change"
+  color: ee0701
+  description: "A change that changes the API or breaks backward compatibility for users."
+- name: "bugfix"
+  color: ee0701
+  description: "Inconsistencies or issues which will cause a problem for users or implementors."
+- name: "documentation"
+  color: 0052cc
+  description: "Solely about the documentation of the project."
+- name: "enhancement"
+  color: 1d76db
+  description: "Enhancement of the code, not introducing new features."
+- name: "refactor"
+  color: 1d76db
+  description: "Updating the code with simpler, easier to understand or more efficient syntax or methods, but not introducing new features."
+- name: "performance"
+  color: 1d76db
+  description: "Improving performance of the project, not introducing new features."
+- name: "new-feature"
+  color: 0e8a16
+  description: "New features or options."
+- name: "maintenance"
+  color: 2af79e
+  description: "Generic maintenance tasks."
+- name: "ci"
+  color: 1d76db
+  description: "Work that improves the continuous integration."
+- name: "dependencies"
+  color: 1d76db
+  description: "Change in project dependencies."
+
+- name: "in-progress"
+  color: fbca04
+  description: "Issue is currently being worked on by a developer."
+- name: "stale"
+  color: fef2c0
+  description: "No activity for quite some time."
+- name: "no-stale"
+  color: fef2c0
+  description: "This is exempt from the stale bot."
+
+- name: "security"
+  color: ee0701
+  description: "Addressing a vulnerability or security risk in this project."
+- name: "incomplete"
+  color: fef2c0
+  description: "Missing information."
+- name: "invalid"
+  color: fef2c0
+  description: "This is off-topic, spam, or otherwise doesn't apply to this project."
+
+- name: "beginner-friendly"
+  color: 0e8a16
+  description: "Good first issue for people wanting to contribute to this project."
+- name: "help-wanted"
+  color: 0e8a16
+  description: "We need some extra helping hands or expertise in order to resolve this!"
+
+- name: "priority-critical"
+  color: ee0701
+  description: "Must be addressed as soon as possible."
+- name: "priority-high"
+  color: b60205
+  description: "After critical issues are fixed, these should be dealt with before any further issues."
+- name: "priority-medium"
+  color: 0e8a16
+  description: "This issue may be useful, and needs some attention."
+- name: "priority-low"
+  color: e4ea8a
+  description: "Nice addition, maybe... someday..."
+
+- name: "major"
+  color: b60205
+  description: "This PR causes a major bump in the version number."
+- name: "minor"
+  color: 0e8a16
+  description: "This PR causes a minor bump in the version number."

.github/workflows/codeql.yml

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+---
+name: CodeQL
+
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: "30 1 * * 0"
+
+jobs:
+  codeql:
+    name: 🏭 Scanning
+    runs-on: ubuntu-latest
+    steps:
+      - name: ⤵️ Check out code from GitHub
+        uses: actions/checkout@v2
+      - name: 🏗 Initialize CodeQL
+        uses: github/codeql-action/init@v1
+      - name: 🚀 Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@v1

.github/workflows/labels.yml

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+---
+name: Sync labels
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - .github/labels.yml
+
+jobs:
+  labels:
+    name: ♻️ Sync labels
+    runs-on: ubuntu-latest
+    steps:
+      - name: ⤵️ Check out code from GitHub
+        uses: actions/checkout@v2
+      - name: 🚀 Run Label Syncer
+        uses: micnncim/[email protected]
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/lock.yml

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+---
+name: Lock
+
+on:
+  schedule:
+    - cron: "0 9 * * *"
+  workflow_dispatch:
+
+jobs:
+  lock:
+    name: 🔒 Lock closed issues and PRs
+    runs-on: ubuntu-latest
+    steps:
+      - uses: dessant/[email protected]
+        with:
+          github-token: ${{ github.token }}
+          issue-lock-inactive-days: "30"
+          issue-lock-reason: ""
+          issue-comment: >
+            Issue closed and locked due to lack of activity.
+
+            If you encounter this same issue, please open a new issue and refer
+            to this closed one.
+          pr-lock-inactive-days: "1"
+          pr-lock-reason: ""
+          pr-comment: >
+            Pull Request closed and locked due to lack of activity.
+
+            If you'd like to build on this closed PR, you can clone it using
+            this method: https://stackoverflow.com/a/14969986
+
+            Then open a new PR, referencing this closed PR in your message.

.github/workflows/pr-labels.yml

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+---
+name: PR Labels
+
+on:
+  pull_request:
+    types: [opened, labeled, unlabeled, synchronize]
+
+jobs:
+  pr_labels:
+    name: 🏭 Verify
+    runs-on: ubuntu-latest
+    steps:
+      - name: 🏷 Verify PR has a valid label
+        uses: jesusvasquez333/[email protected]
+        with:
+          github-token: "${{ secrets.GITHUB_TOKEN }}"
+          valid-labels: >-
+            breaking-change, bugfix, documentation, enhancement,
+            refactor, performance, new-feature, maintenance, ci, dependencies
+          disable-reviews: true

.github/workflows/stale.yml

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+---
+name: Stale
+
+on:
+  schedule:
+    - cron: "0 8 * * *"
+  workflow_dispatch:
+
+jobs:
+  stale:
+    name: 🧹 Clean up stale issues and PRs
+    runs-on: ubuntu-latest
+    steps:
+      - name: 🚀 Run stale
+        uses: actions/stale@v3
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          days-before-stale: 30
+          days-before-close: 7
+          remove-stale-when-updated: true
+          stale-issue-label: "stale"
+          exempt-issue-labels: "no-stale,help-wanted"
+          stale-issue-message: >
+            There hasn't been any activity on this issue recently, and in order
+            to prioritize active issues, it will be marked as stale.
+
+            Please make sure to update to the latest version and
+            check if that solves the issue. Let us know if that works for you
+            by leaving a 👍
+
+            Because this issue is marked as stale, it will be closed and locked
+            in 7 days if no further activity occurs.
+
+            Thank you for your contributions!
+          stale-pr-label: "stale"
+          exempt-pr-labels: "no-stale"
+          stale-pr-message: >
+            There hasn't been any activity on this pull request recently, and in
+            order to prioritize active work, it has been marked as stale.
+
+            This PR will be closed and locked in 7 days if no further activity
+            occurs.
+
+            Thank you for your contributions!