T7413: added pr mirror workflows

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- All PR should follow this template to allow a clean and transparent review -->
+<!-- Text placed between these delimiters is considered a comment and is not rendered -->
+
+## Change summary
+<!--- Provide a general summary of your changes in the Title above -->
+
+## Types of changes
+<!---
+What types of changes does your code introduce? Put an 'x' in all the boxes that apply.
+NOTE: Markdown requires no leading or trailing whitespace inside the [ ] for checking
+the box, please use [x]
+-->
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Code style update (formatting, renaming)
+- [ ] Refactoring (no functional changes)
+- [ ] Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
+- [ ] Other (please describe):
+
+## Related Task(s)
+<!-- optional: Link to related other tasks on Phabricator. -->
+<!-- * https://vyos.dev/Txxxx -->
+
+## Related PR(s)
+<!-- Link here any PRs in other repositories that are required by this PR -->
+
+## Checklist:
+<!--- Go over all the following points, and put an `x` in all the boxes that apply. -->
+<!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
+<!--- The entire development process is outlined here: https://docs.vyos.io/en/latest/contributing/development.html -->
+- [ ] I have read the [**CONTRIBUTING**](https://github.com/vyos/vyos-1x/blob/current/CONTRIBUTING.md) document
+- [ ] I have linked this PR to one or more Phabricator Task(s)
+- [ ] My commit headlines contain a valid Task id
+- [ ] My change requires a change to the documentation
+- [ ] I have updated the documentation accordingly

.github/workflows/cleanup-mirror-pr-branch.yml

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+name: Cleanup pr mirror branch
+
+on:
+  pull_request:
+    types: [closed]
+    branches:
+        - current
+
+permissions:
+  contents: write
+
+jobs:
+  call-delete-branch:
+    if: github.repository_owner != 'vyos'
+    uses: vyos/.github/.github/workflows/cleanup-mirror-pr-branch.yml@current
+    secrets: inherit

.github/workflows/mirror-pr-and-sync.yml

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+name: Create Mirror PR and Repo Sync
+on:
+  workflow_dispatch:
+    inputs:
+      sync_branch:
+        description: 'branch to sync'
+        required: true
+        type: string
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  call-mirror-pr-and-sync:
+    if: github.repository_owner != 'vyos'
+    uses: VyOS-Networks/vyos-reusable-workflows/.github/workflows/mirror-pr-and-sync.yml@main
+    with:
+      sync_branch: ${{ inputs.sync_branch }}
+    secrets:
+      PAT: ${{ secrets.PAT }}

.github/workflows/trigger-pr-mirror-repo-sync.yml

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+name: Trigger Mirror PR and Repo Sync
+on:
+  pull_request_target:
+      types:
+        - closed
+      branches:
+        - current
+
+jobs:
+  call-trigger-mirror-pr-repo-sync:
+    if: github.repository_owner == 'vyos' && github.event.pull_request.merged == true
+    uses: vyos/.github/.github/workflows/trigger-pr-mirror-repo-sync.yml@current
+    secrets: inherit