chore: remove obsolete GitHub workflows

* Deleted workflows for Docker Hub description, keepalive, and copyright year updates.
* These workflows are no longer needed and have been removed to streamline the CI/CD process.

.github/workflows/dockerhub-description.yml

@@ -1,25 +0,0 @@
-name: Update Docker Hub Description
-on:
-  workflow_dispatch:
-  push:
-    paths:
-      - README.md
-      - .github/workflows/dockerhub-description.yml
-    branches:
-      - main
-
-jobs:
-  dockerhub-description:
-    name: Docker Hub Description
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-
-      - name: Docker Hub Description
-        uses: peter-evans/dockerhub-description@v4
-        with:
-          username: ${{ secrets.DOCKER_HUB_USERNAME }}
-          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
-          repository: ${{ secrets.DOCKER_HUB_REPO }}
-          short-description: ${{ github.event.repository.description }}

.github/workflows/keepalive.yml

@@ -1,21 +0,0 @@
-name: Keepalive Workflow
-on:
-  schedule:
-    - cron: "0 0 * * *"
-jobs:
-  main-job:
-    name: Main Job
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      # - step1
-      # - step 2
-      # - Step N
-  keepalive-job:
-    name: Keepalive Workflow
-    runs-on: ubuntu-latest
-    permissions:
-      actions: write
-    steps:
-      - uses: actions/checkout@v4
-      - uses: gautamkrishnar/keepalive-workflow@v2

.github/workflows/update-copyright-years-in-license-file.yml

@@ -1,24 +0,0 @@
-name: Update copyright year(s) in license file
-on:
-  workflow_dispatch:
-  schedule:
-    - cron: "0 3 1 1 *" # 03:00 AM on January 1
-
-jobs:
-  update-license-year:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-      - name: Action Update License Year
-        uses: FantasticFiasco/action-update-license-year@v3
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          path: LICENSE.md
-      - name: Merge pull request
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          gh pr merge --merge --delete-branch