.github/workflow: remove automatic creation of pull request at github.com/VictoriaMetrics/ops repository on new tag

This automation doesn't work as intended on LTS releases, bugfix releases and custom releases,
since it assumes every new tag is related only to new release.

Also the github.com/VictoriaMetrics/ops repository may contain manually set custom tags
for VictoriaMetrics components (for example, for testing the latest bugfixes or features),
which are overwritten by the generated pull request.

The way to go is to manually update tags at github.com/VictoriaMetrics/ops repository when needed
instead of trying to automate this process.

.github/workflows/update-sandbox.yml

@@ -1,80 +0,0 @@
-name: sandbox-release
-on:
-  release:
-    types: [published]
-permissions:
-  contents: write
-jobs:
-  deploy-sandbox:
-    runs-on: ubuntu-latest
-    steps:
-      - name: check inputs
-        if: github.event.release.tag_name == ''
-        run: exit 1
-    
-      - name: Check out code
-        uses: actions/checkout@v4
-        with:
-          repository: VictoriaMetrics/ops
-          token: ${{ secrets.VM_BOT_GH_TOKEN }}
-
-      - name: Import GPG key
-        id: import-gpg
-        uses: crazy-max/ghaction-import-gpg@v5
-        with:
-          gpg_private_key: ${{ secrets.VM_BOT_GPG_PRIVATE_KEY }}
-          passphrase: ${{ secrets.VM_BOT_PASSPHRASE }}
-          git_user_signingkey: true
-          git_commit_gpgsign: true
-
-      - name: update image tag
-        uses: fjogeleit/yaml-update-action@main
-        with:
-          valueFile: 'gcp-test/sandbox/manifests/benchmark-vm/vmcluster.yaml'
-          commitChange: false
-          createPR: false
-          changes: |
-            {
-              "gcp-test/sandbox/manifests/benchmark-vm/vmcluster.yaml": {
-                "spec.vminsert.image.tag": "${{ github.event.release.tag_name }}-enterprise-cluster",
-                "spec.vmselect.image.tag": "${{ github.event.release.tag_name }}-enterprise-cluster",
-                "spec.vmstorage.image.tag": "${{ github.event.release.tag_name }}-enterprise-cluster"
-              },
-              "gcp-test/sandbox/manifests/benchmark-vm/vmsingle.yaml": {
-                "spec.image.tag": "${{ github.event.release.tag_name }}-enterprise"
-              },
-              "gcp-test/sandbox/manifests/monitoring/monitoring-vmagent.yaml": {
-                "spec.image.tag": "${{ github.event.release.tag_name }}"
-              },
-              "gcp-test/sandbox/manifests/monitoring/monitoring-vmcluster.yaml": {
-                "spec.vminsert.image.tag": "${{ github.event.release.tag_name }}-enterprise-cluster",
-                "spec.vmselect.image.tag": "${{ github.event.release.tag_name }}-enterprise-cluster",
-                "spec.vmstorage.image.tag": "${{ github.event.release.tag_name }}-enterprise-cluster"
-              },
-              "gcp-test/sandbox/manifests/monitoring/vmalert.yaml": {
-                "spec.image.tag": "${{ github.event.release.tag_name }}-enterprise"
-              }
-            }
-
-      - name: commit changes
-        run: |
-          git config --global user.name "${{ steps.import-gpg.outputs.email }}"
-          git config --global user.email "${{ steps.import-gpg.outputs.email }}"
-          git add .
-          git commit -S -m "Deploy image tag ${RELEASE_TAG} to sandbox"
-        env:
-          RELEASE_TAG: ${{ github.event.release.tag_name }}
-
-      - name: Create Pull Request
-        uses: peter-evans/create-pull-request@v5
-        with:
-          author: ${{ github.actor }} <${{ github.actor }}@users.noreply.github.com>
-          branch: release-automation
-          token: ${{ secrets.VM_BOT_GH_TOKEN }}
-          delete-branch: true
-          title: "release ${{ github.event.release.tag_name }}"
-          body: |
-            Release [${{ github.event.release.tag_name }}](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/${{ github.event.release.tag_name }}) to sandbox
-        
-            > Auto-generated by `Github Actions Bot`
-