remove unused workflows, especially the pr-closed which always failed

Signed-off-by: Guillaume Lours <guillaume.lours@docker.com>

.github/workflows/artifacts.yml

@@ -1,60 +0,0 @@
-name: Publish Artifacts
-env:
-  GO_VERSION: 1.18.4
-on:
-  issue_comment:
-    types: [created]
-jobs:
-  publish-artifacts:
-    if: github.event.issue.pull_request != '' && contains(github.event.comment.body, '/generate-artifacts')
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout code into the Go module directory
-        uses: actions/checkout@v3
-
-      - name: Set up Go ${{ env.GO_VERSION }}
-        uses: actions/setup-go@v3
-        with:
-          go-version: ${{ env.GO_VERSION }}
-          cache: true
-
-      - name: Build cross platform compose-plugin binaries
-        run: make -f builder.Makefile cross
-
-      - name: Upload macos-amd64 binary
-        uses: actions/upload-artifact@v3
-        with:
-          name: docker-compose-darwin-amd64
-          path: ${{ github.workspace }}/bin/docker-compose-darwin-amd64
-
-      - name: Upload macos-arm64 binary
-        uses: actions/upload-artifact@v3
-        with:
-          name: docker-compose-darwin-arm64
-          path: ${{ github.workspace }}/bin/docker-compose-darwin-arm64
-
-      - name: Upload linux-amd64 binary
-        uses: actions/upload-artifact@v3
-        with:
-          name: docker-compose-linux-amd64
-          path: ${{ github.workspace }}/bin/docker-compose-linux-amd64
-
-      - name: Upload linux-ppc64le binary
-        uses: actions/upload-artifact@v3
-        with:
-          name: docker-compose-linux-ppc64le
-          path: ${{ github.workspace }}/bin/docker-compose-linux-ppc64le
-
-      - name: Upload windows-amd64 binary
-        uses: actions/upload-artifact@v3
-        with:
-          name: docker-compose-windows-amd64.exe
-          path: ${{ github.workspace }}/bin/docker-compose-windows-amd64.exe
-
-      - name: Update comment
-        uses: peter-evans/create-or-update-comment@v1
-        with:
-          comment-id: ${{ github.event.comment.id }}
-          body: |
-            This PR can be tested using [binaries](https://github.com/docker/compose-cli/actions/runs/${{ github.run_id }}).
-          reactions: eyes

.github/workflows/pr-closed.yml

@@ -1,11 +0,0 @@
-name: PR cleanup
-on:
-  pull_request:
-    types: [closed]
-jobs:
-  delete_pr_artifacts:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: stefanluptak/delete-old-pr-artifacts@v1
-        with:
-          workflow_filename: ci.yaml